Dag Trygve Eckhoff Wisland

• Moulin, Kaspar Sigurd; Lande, Tor Sverre; Aunet, Snorre & Wisland, Dag Trygve Eckhoff (2026). Efficient Asynchronous Sampling of Ripple Counter in VCO-ADC Using Ripple Register and Event Arbitration. IEEE Transactions on Circuits and Systems - II - Express Briefs. ISSN 1549-7747. 73(2), p. 138–142. doi: https:/ieeexplore.ieee.org/document/11339947. Full text in Research Archive Show summary

  We present a power and area-efficient solution for robust asynchronous sampling of a ripple counter for coarse-fine VCO-ADCs. We show that by replacing the parallel register with a delay-matched sequential register and utilizing asynchronous arbitration, sampling errors are avoided. Post-layout simulation of a 7-bit system shows that our proposed solution tolerates VCO frequencies <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$197\times $ </tex-math></inline-formula> higher than the baseline design, while requiring a 42 % increase in power and a 26 % area overhead, thereby improving upon a state-of-the-art double-counter solution.

• Rahman, Habibur; Recha, Adrian Miguel Llop; Wisland, Dag Trygve Eckhoff & Kjelgård, Kristian Gjertsen (2025). Dual-Mode Resonant Sensor for Depth Spectroscopy. In Manganaro, Gabriele (Eds.), 2025 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9798350356830. p. 1–5. doi: 10.1109/iscas56072.2025.11043763. Full text in Research Archive
• Rahman, Habibur; Recha, Adrian Miguel Llop; Wisland, Dag Trygve Eckhoff & Kjelgård, Kristian Gjertsen (2025). Conure: Expanded Surrogate-Based Artwork Generator for RFCMOS Transformers. In EuCAP (Eds.), 2025 19th European Conference on Antennas and Propagation (EuCAP). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9788831299107. p. 1–5. doi: 10.23919/eucap63536.2025.10999249. Full text in Research Archive
• Recha, Adrian Miguel Llop; Wisland, Dag Trygve Eckhoff; Lande, Tor Sverre & Kjelgård, Kristian Gjertsen (2024). Modelling of differential probing analysis for biomedical dielectric spectroscopy. IET Science, Measurement & Technology. ISSN 1751-8822. 19(1), p. 1–12. doi: 10.1049/smt2.12216. Full text in Research Archive Show summary

  Transcutaneous microwave dielectric spectroscopy holds promise as a modality for non-invasive subcutaneous biomarker monitoring, such as blood glucose levels. Experimental studies have demonstrated a strong correlation between blood glucose concentration and blood permittivity using microwave signals. However, the sample volume of interest, blood vessels, is located underneath skin layers where the microwave signal interaction with other surrounding biomaterials is accumulated. Here, a computational study of the proposed method to mitigate the contribution of unwanted tissue and thereby increase the specificity of subcutaneous spectroscopy, using differential probing analysis (DPA), is presented. By exploiting the relationship between the diameter of an open-ended coaxial probe (OCP) and the size of its protruding electric field, two OCPs with different sizes can sense different volumes beneath the skin. The proposed method computationally subtracts the effect of unwanted tissue, estimated with the smaller probe, from the effective contribution of both blood and unwanted tissue with the larger one. The method is validated by using simulated models and data from the full wave software CST Studio Suite across frequencies ranging from 1 to 10 GHz, achieving errors comparable to state-of-the-art techniques.

• Rahman, Habibur; Recha, Adrian Miguel Llop; Fasciani, Stefano; Hogganvik, Pål Gunnar; Kjelgård, Kristian Gjertsen & Wisland, Dag Trygve Eckhoff (2024). Conure: Surrogate-based Artwork Generator for RFCMOS Integrated Inductors. IEEE International Symposium on Circuits and Systems proceedings. ISSN 0271-4302. doi: 10.1109/ISCAS58744.2024.10558598. Full text in Research Archive
• Amble, Magnus; Aunet, Snorre; Wisland, Dag Trygve Eckhoff & Kjelgård, Kristian Gjertsen (2023). Randomized Bulk-Voltages: A Countermeasure to Mask Side-Channel Leakage of CMOS Logic Gates. In Setti, Gianluca & Manganaro, M. (Ed.), Proceedings,2023 IEEE 66th International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9798350302103. p. 708–712. doi: 10.1109/MWSCAS57524.2023.10406067. Full text in Research Archive
• Recha, Adrian Miguel Llop; Wisland, Dag Trygve Eckhoff; Lande, Tor Sverre & Kjelgård, Kristian Gjertsen (2023). Enhancing Measurement Specificity in Biological Samples with Differential Probing Analysis. In Soh, Ping Jack (Eds.), 2023 IEEE MTT-S International Microwave Biomedical Conference (IMBioC) Proceedings. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781665492171. p. 370–384. doi: 10.1109/IMBioC56839.2023.10304877. Full text in Research Archive
• Recha, Adrian Miguel Llop; Wisland, Dag Trygve Eckhoff; Lande, Tor Sverre; Kjelgård, Kristian Gjertsen & Cauwenberghs, Gert (2023). Wideband Proximity Coupling Sensor for Wrist Heart Rate Monitoring. In Chen, Jie (Eds.), 2023 IEEE Biomedical Circuits and Systems Conference (BioCAS). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9798350300260. doi: 10.1109/BioCAS58349.2023.10388551. Full text in Research Archive
• Recha, Adrian Miguel Llop; Wisland, Dag Trygve Eckhoff; Lande, Tor Sverre & Kjelgård, Kristian Gjertsen (2022). Differential Analysis in Microwave Dielectric Probing for Transcutaneous Biomedical Sensing, 2021 51st European Microwave Conference (EuMC). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9782874870620. p. 845–848. doi: 10.23919/EuMC50147.2022.9784189. Full text in Research Archive
• Kjelgård, Kristian Gjertsen; Wisland, Dag T & Lande, Tor Sverre (2018). 3D Printed Wideband Microwave Absorbers using Composite Graphite/PLA Filament. In Suárez, Rodríguez Almudena (Eds.), 2018 48th European Microwave Conference (EuMC). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9782874870514. p. 859–862. doi: 10.23919/EuMC.2018.8541699. Full text in Research Archive
• Andersen, Nikolaj; Granhaug, Kristian; Michaelsen, Jørgen Andreas; Bagga, Sumit; Hjortland, Håkon André & Knutsen, Mats Risopatron [Show all 8 contributors for this article] (2017). A 118mW 23.3GS/s dual-band 7.3GHz and 8.7GHz impulse-based direct RF sampling radar SoC in 55nm CMOS. Digest of technical papers - IEEE International Solid-State Circuits Conference. ISSN 0193-6530. 60, p. 138–140. doi: 10.1109/ISSCC.2017.7870299. Full text in Research Archive
• Andersen, Nikolaj; Granhaug, Kristian; Michaelsen, Jørgen Andreas; Bagga, Sumit; Hjortland, Håkon André & Knutsen, Mats Risopatron [Show all 8 contributors for this article] (2017). A 118-mW Pulse-Based Radar SoC in 55-nm CMOS for Non-Contact Human Vital Signs Detection. IEEE Journal of Solid-State Circuits. ISSN 0018-9200. 52(12), p. 3421–3433. doi: 10.1109/JSSC.2017.2764051. Full text in Research Archive
• Moradi, Farshad; Panagopoulos, Georgios; Karakonstantis, Georgios; Farkhani, Hooman; Wisland, Dag Trygve Eckhoff & Madsen, Jens K. [Show all 8 contributors for this article] (2014). Multi-level wordline driver for robust SRAM design in nano-scale CMOS technology. Microelectronics Journal. ISSN 0959-8324. 45(1), p. 23–34. doi: 10.1016/j.mejo.2013.09.009. Full text in Research Archive
• Michaelsen, Jørgen Andreas & Wisland, Dag T (2013). Noise and linearity analysis of a frequency to voltage converter. In Sekanina, Lukas; Fey, Görschwin; Raik, Jaan; Aunet, Snorre & Růžička, Richard (Ed.), Proceedings of the 2013 IEEE 16th International Symposium on Design and Diagnostics of Electronic Circuits & Systems (DDECS). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781467361330. p. 228–231. doi: 10.1109/DDECS.2013.6549822. Full text in Research Archive
• Michaelsen, Jørgen Andreas & Wisland, Dag T (2013). A VCO linearization system for ADC applications. In Loumeau, Patrick & Sawan, Mohamad (Ed.), Proceedings of the 2013 IEEE 11th International New Circuits and Systems Conference (NEWCAS). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781479906192. doi: 10.1109/NEWCAS.2013.6573623. Full text in Research Archive
• Moradi, Farshad; Cao, Tuan Vu; Vatajelu, Elena I.; Peiravi, Ali; Mahmoodi, Hamid & Wisland, Dag T (2013). Domino logic designs for high-performance and leakage-tolerant applications. Integration. ISSN 0167-9260. 46(3), p. 247–254. doi: 10.1016/j.vlsi.2012.04.005. Full text in Research Archive
• Wisland, Dag T; Støa, Stig; Andersen, Nikolaj; Granhaug, Kristian; Lande, Tor Sverre & Hjortland, Håkon André (2012). CMOS nanoscale impulse radar utilized in 2-dimensional ISAR imaging system. In Blair, William Dale & Bruder, Joseph (Ed.), 2012 IEEE RADAR CONFERENCE. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781467306560. p. 714–719. doi: 10.1109/radar.2012.6212231. Full text in Research Archive
• Cao, Tuan-Vu; Maier, Christoph; Wisland, Dag T; Lande, Tor Sverre & Cauwenbergh, Gert (2012). BFSK Mics Direct-DCO Transmitter with Adaptive Background Frequency Regulation. In Deval, Yann; Begueret, Jean-Baptiste & Belot, Didier (Ed.), ESSCIRC (ESSCIRC), 2012 Proceedings of the. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781467322126. p. 305–308. doi: 10.1109/esscirc.2012.6341315. Full text in Research Archive
• Cao, Tuan-Vu; Wisland, Dag T & Lande, Tor Sverre (2012). High resolution Frequency-based Delta-Sigma Modulator utilizing multi-phase quantizer. In Sunwoo, Myung Hoon & Kang, Sung-Mo (Ed.), Circuits and Systems (ISCAS), 2012 IEEE International Symposium on. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781467302180. p. 3009–3012. doi: 10.1109/iscas.2012.6271951. Full text in Research Archive
• Maier, C.; Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre & Cauwenberghs, G. (2011). Fast-settling multiple-loop adaptive frequency locking scheme for energy-efficient resonant FSK transmitter. Electronics Letters. ISSN 0013-5194. 47(14), p. 794–U78. doi: 10.1049/el.2011.1448. Full text in Research Archive
• Michaelsen, Jørgen Andreas; Ramstad, Jan Erik; Wisland, Dag T & Søråsen, Oddvar (2011). Low-power Sensor Interfacing and MEMS for Wireless Sensor Networks. In Tarannum, Suraiya (Eds.), Wireless Sensor Networks. IntechOpen. ISSN 9789533073255. Full text in Research Archive
• Meier, C; Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre & Cauwenberghs, G. (2011). Energy-Efficient Resonant BFSK MICS Transmitter with Fast-Settling Dual-Loop Adaptive Frequency Locking. In Lubaszewski, Marcelo & IEEE, ISCAS (Ed.), Proc. 2011 IEEE International Symposium on Circuits and Systems. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424494729. p. 2601–2604. doi: 10.1109/iscas.2011.5938137. Full text in Research Archive
• Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre & Moradi, Farshad (2011). Low phase-noise VCO utilizing modified symmetric load and partial positive feedback for FDSM. Analog Integrated Circuits and Signal Processing. ISSN 0925-1030. 73(1), p. 151–160. doi: 10.1007/s10470-011-9803-6. Full text in Research Archive
• Moradi, Farshad; Cao, Tuan Vu; Wisland, Dag T; Aunet, Snorre & Mahmoodi, Hamid (2011). Optimal Body Biasing for Maximizing Circuit Performance in 65nm CMOS Technology. The Midwest Symposium on Circuits and Systems conference proceedings. ISSN 1548-3746. doi: 10.1109/mwscas.2011.6026651. Full text in Research Archive
• Moradi, Farshad; Gupta, Sumeet Kumar; Panagopoulos, Georgios; Wisland, Dag T; Mahmoodi, Hamid & Roy, Kaushik (2011). Asymmetrically Doped FinFETs for Low-Power Robust SRAMs. IEEE Transactions on Electron Devices. ISSN 0018-9383. 58(12), p. 4241–4249. doi: 10.1109/TED.2011.2169678. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Berg, Yngvar; Aunet, Snorre & Cao, Tuan Vu (2010). Process Variations in Sub-Threshold SRAM Cells in 65nm CMOS. In Alioto, Massimo (Eds.), Proceedings of the 22nd International Conference on Microelectronics. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424481569. Full text in Research Archive
• Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre & Moradi, Farshad (2010). Rail-to-Rail Low-Power Fully Differential OTA Utilizing Adaptive Biasing and Partial Feedback. IEEE International Symposium on Circuits and Systems proceedings. ISSN 0271-4302. p. 2820–2823. Full text in Research Archive
• Liseth, Olav Evensen; Mo, Daniel; Hjortland, Håkon André; Lande, Tor Sverre & Wisland, Dag T (2010). Power-Efficient Cross-Correlation Beat Detection in Electrocardiogram Analysis Using Bitstreams. IEEE Transactions on Biomedical Circuits and Systems. ISSN 1932-4545. 4(6), p. 419–425. doi: 10.1109/TBCAS.2010.2079933. Full text in Research Archive
• Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre & Moradi, Farshad (2010). Rail-to-rail low-power fully differential OTA utilizing adaptive biasing and partial feedback. In Serdijn, Wouter A. (Eds.), Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424453085. p. 2820–2823. Full text in Research Archive
• Michaelsen, Jørgen Andreas & Wisland, Dag T (2010). A Low-Voltage Low-Power Frequency-to-Voltage Converter for VCO Feedback Linearization. In Stouraitis, Thanos; Macii, Enrico & Paliouras, Vassilis (Ed.), 2010 IEEE International Conference on Electronics, Circuits, and Systems (ICECS 2010). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424481569. p. 1139–1142. Full text in Research Archive
• Michaelsen, Jørgen Andreas & Wisland, Dag T (2010). Digital PVT Calibration of a Frequency-to-Voltage Converter. In Nurmi, Jari & Halonen, Kari (Ed.), Norchip 2010, 28th Norchip Conference. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424489732. Full text in Research Archive
• Moradi, Farshad; Augustin, Charles; Goel, Ashish; Karakonstantis, Georgios; Cao, Tuan Vu & Wisland, Dag T [Show all 8 contributors for this article] (2010). Data-Dependant Sense-Amplifier Flip-Flop for Low Power Applications. Proceedings of the IEEE Custom Integrated Circuits Conference. ISSN 0886-5930. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Mahmoodi, Hamid; Berg, Yngvar & Cao, Tuan Vu (2010). New SRAM Design Using Body Bias Technique for Ultra Low Power Applications. In Gadepally, Kamesh (Eds.), Proceedings of the Eleventh International Symposium on Quality of Electronic Design (ISQED 2010). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424464548. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Berg, Yngvar; Aunet, Snorre & Cao, Tuan Vu (2010). Process Variations in Sub-Threshold SRAM Cells in 65nm CMOS. Proceedings of the IEEE International Conference on Microelectronic Test Structures. ISSN 1071-9032. p. 371–374. Full text in Research Archive
• Peiravi, Ali; Moradi, Farshad & Wisland, Dag T (2009). Leakage Tolerant, Noise Immune domino logic for circuit design in the ultra deep sub-micron CMOS technology for haigh fan-in gates. Journal of Applied Sciences. ISSN 1812-5654. 9(2), p. 392–396. doi: 10.3923/jas.2009.392.396. Full text in Research Archive
• Liseth, Olav Evensen; Mo, Daniel; Hjortland, Håkon André; Lande, Tor Sverre & Wisland, Dag T (2009). Power Efficient Cross-Correlation Using Bitstreams. In Ytterdal, Trond & Aunet, Snorre (Ed.), Proceedings of the 27th Norchip Conference, Trondheim, 16.-17. November, 2009. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424443116. Full text in Research Archive
• Dahl, Øyvind; Hjortland, Håkon André; Lande, Tor Sverre & Wisland, Dag T (2009). Close range impulse radio beamformers. In Beaulieu, Norman & Milstein, Laurence (Ed.), Ultra-Wideband, 2009. ICUWB 2009. IEEE International Conference on. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424429301. p. 205–209. Full text in Research Archive
• Cao, Tuan Vu; Wisland, Dag T; Moradi, Farshad & Lande, Tor Sverre (2009). Novel Low Voltage Current-Mirror Sense Amplifier Based Flip-Flop with Reduced Delay Time. In Nowrouzian, Behrouz (Eds.), Proceedings of the 2009 International Symposium on Circuits and Systems. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424438273. p. 3166–3169. Full text in Research Archive
• Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre & Moradi, Farshad (2009). Low Phase-Noise and Wide Tuning-Range CMOS Differential VCO for Sigma-Delta Frequency Modulator, 2009 IEEE Computer Society Annual Symposium on VLSI (ISVLSI). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424444083. p. 13–18. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Mahmoodi, Hamid; Cao, Tuan Vu & Dooghabadi, Malihe Zarre (2009). Adaptive Supply Voltage Circuit Using Body Bias Technique. In Napieralski, Andrzej (Eds.), Mixed Design of Integrated Circuits and Systems. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9788392875604. p. 215–219. Full text in Research Archive
• Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre & Moradi, Farshad (2009). Low-Power, Enhanced-Gain Adaptive-Biasing based Operational Transconductance Amplifiers. In Ytterdal, Trond & Aunet, Snorre (Ed.), Proceedings of the 27th Norchip Conference, Trondheim, 16.-17. November, 2009. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424443116. Full text in Research Archive
• Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre & Moradi, Farshad (2009). Low Phase-Noise VCO Utilizing NMOS Symmetric Load for Frequency-Based Delta-Sigma Modulators. In Hamoui, Anas & Malcovati, Piero (Ed.), The 16th IEEE International Conference on Electronics, Circuits, and Systems (ICECS 2009). IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424450916. p. 767–770. Full text in Research Archive
• Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre & Moradi, Farshad (2009). A Design of Bulk-Controlled Ring-VCO with 1/f-Noise Reduction for Frequency delta-sigma Modulator. In Napieralski, Andrzej (Eds.), Mixed Design of Integrated Circuits and Systems. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9788392875604. p. 187–192. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Mahmoodi, Hamid; Peiravi, Ali; Aunet, Snorre & Cao, Tuan Vu (2009). New subthreshold concepts in 65nm CMOS technology. In Immaneni, Lalitha (Eds.), Proceedings of the 10th IEEE International Symposium on Quality Electronic Design. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424429523. p. 162–166. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Mahmoodi, Hamid; Aunet, Snorre; Cao, Tuan Vu & Peiravi, Ali (2009). Ultra Low Power Full Adder Topologies. In Nowrouzian, Behrouz (Eds.), Proceedings of the 2009 International Symposium on Circuits and Systems. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424438273. p. 3158–3161. Full text in Research Archive
• Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre & Moradi, Farshad (2008). Low-Voltage, Low-Power, and Wide-Tuning-Range Ring-VCO for Frequency ΔΣ Modulator. In Ellervee, Peeter & Jervan, Gert (Ed.), Proceedings of 26th IEEE Norchip Conference. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424424931. Full text in Research Archive
• Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre; Moradi, Farshad & Kim, Young Hee (2008). Novel Start-up Circuit with Enhanced Power-up Characteristic for Bandgap References. In Buckner, Thomas & Marshall, Andrew (Ed.), Proccedings, IEEE SOC Conference. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424425969. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Cao, Tuan Vu; Peiravi, Ali & Mahmoodi, Hamid (2008). 1-Bit Sub Threshold Full Adder in 65nm CMOS Technology. In Elwakil, A. & Anis, M. (Ed.), Proceedings of 20th International Conference on Microelectronics. IEEE (Institute of Electrical and Electronics Engineers). Full text in Research Archive
• Michaelsen, Jørgen Andreas & Wisland, Dag T (2008). Towards a Second Order FDSM Analog-to-Digital Converter for Wireless Sensor Network Nodes. In Ellervee, Peeter & Jervan, Gert (Ed.), Proceedings of 26th IEEE Norchip Conference. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424424931. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Aunet, Snorre; Mahmoodi, Hamid & Cao, Tuan Vu (2008). 65nm Sub-Threshold 11t-SRAM for Ultra Low Voltage Applications. In Buckner, Thomas & Marshall, Andrew (Ed.), Proccedings, IEEE SOC Conference. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424425969. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Mahmoodi, Hamid & Cao, Tuan Vu (2008). High speed and leakage-tolerant domino circuits for high fan-in applications in 70nm CMOS technology. In Murphy, Roberto (Eds.), 7th IEEE International Caribbean Conference on Devices, Circuits and Systems, 2008. ICCDCS 2008. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424419562. p. 1–5. Full text in Research Archive
• Wismar, Ulrik & Wisland, Dag T (2007). A 0.2V, 7.5 μW, 20 kHz ΣΔ modulator with 69 dB SNR in 90 nm CMOS. European Conference on Solid-State Circuits (ESSCIRC). ISSN 1930-8833. p. 206–209. Full text in Research Archive
• Michaelsen, Jørgen Andreas & Wisland, Dag T (2007). Suppression of delta-sigma DAC quantisation noise by bandwidth adaptation. In Petraglia, Antonio (Eds.), SBCCI '07: Proceedings of the 20th annual conference on Integrated circuits and systems design. ACM Publications. ISSN 9781595938169. p. 16–20. Full text in Research Archive
• Hjortland, Håkon André; Wisland, Dag T; Lande, Tor Sverre; Limbodal, Claus & Meisal, Kjetil (2007). Thresholded samplers for UWB impulse radar. In Ling, Nam & Setti, Gianluca (Ed.), Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424409211. p. 1210–1213. Full text in Research Archive
• Wismar, Ulrik; Wisland, Dag T & Andreani, Pietro (2006). A 0.2V 0.44uW Audio Analog to Digital Delta Sigma Modulator with 57 fJ/conversion FoM. European Conference on Solid-State Circuits (ESSCIRC). ISSN 1930-8833. Full text in Research Archive
• Hjortland, Håkon Andre; Wisland, Dag T; Limbodal, Claus; Meisal, Kjetil & Lande, Tor Sverre (2006). CMOS Impulse Radar. In Johansson, Thomas (Eds.), Proceedings 24th Norchip Conference. IEEE (Institute of Electrical and Electronics Engineers). ISSN 9781424407729. p. 75–79. Full text in Research Archive
• Meisal, Kjetil; Limbodal, Claus; Lande, Tor Sverre & Wisland, Dag T (2005). CMOS Impulse Radio Receiver Front-end. In Rahkonen, Timo (Eds.), Proceedings 2005 NORCHIP conference. IEEE Press. ISSN 9781424400645. Full text in Research Archive
• Limbodal, Claus; Meisal, Kjetil; Lande, Tor Sverre & Wisland, Dag T (2005). A Spatial RAKE-Receiver for Real-Time UWB-IR Applications. In Wittneben, Armin (Eds.), ICU 2005 - IEEE International Conference on Ultra-Wideband Proceedings. IEEE Press. ISSN 9780780393981. p. 65–69. Full text in Research Archive
• Øysted, Karianne & Wisland, Dag T (2005). Piezoresistive CMOS-MEMS Pressure Sensor with Ring Oscillator Readout Including Delta-Sigma Analog-to-Digital Converter On-chip. In Wissel, Larry (Eds.), Proceedings of IEEE Custom Integrated Circuits Conference 2005. IEEE Press. ISSN 9780780390249. p. 511–514. Full text in Research Archive
• Wismar, Ulrik; Wisland, Dag T & Andreani, Pietro (2005). Linearity of Bulk-Controlled Inverter Ring VCO in Weak and Strong Inversion. In Rahkonen, Timo (Eds.), Proceedings 2005 NORCHIP conference. IEEE Press. ISSN 9781424400645. p. 145–148. Full text in Research Archive
• Wisland, Dag T; Høvin, Mats Erling & Lande, Tor Sverre (2004). A non-feedback Delta-Sigma modulator for digital-to-analog conversion using digital frequency modulation. Analog Integrated Circuits and Signal Processing. ISSN 0925-1030. 41(2-3), p. 209–222. Full text in Research Archive
• Høvin, Mats Erling; Wisland, Dag T; Berg, Yngvar & Lande, Tor Sverre (2003). A frequency delta-sigma analog-to-digital converter operating at a power-supply voltage og 0.6 V. Analog Integrated Circuits and Signal Processing. ISSN 0925-1030. Full text in Research Archive
• Høvin, Mats Erling; Wisland, Dag T; Marienborg, Jan Tore; Lande, Tor Sverre & Berg, Yngvar (2001). Pattern Noise in the Frequency Delta-Sigma Modulator. Analog Integrated Circuits and Signal Processing. ISSN 0925-1030. 26(1), p. 75–82. Full text in Research Archive Show summary

  In this paper we show that the first-order freque ncy delta-sigma modulator is equivalent to a traditional delta-sigma modulator with respect to pattern noise. We further propose two techniques for reducing the effect of pattern noise. The first technique is based on time-domain dithering which is implemented by adding white phase noise to the FM signal. The second technique is based on locating the narrow dynamic range that may be in this kind of modulators, in a pattern noise valley. This technique can utilize pattern noise to make the modulator provide significantly higher digital resolution than the white noise quantization model predicts. Finally the theory is verified by measurements.

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• Nurmi, Jari; Wisland, Dag Trygve Eckhoff; Aunet, Snorre & Kjelgård, Kristian Gjertsen (2022). Proceedings, 2022 IEEE Norcas Conference. IEEE (Institute of Electrical and Electronics Engineers). ISBN 9798350345506. 200 p. Full text in Research Archive
• Nurmi, Jari; Wisland, Dag Trygve Eckhoff; Aunet, Snorre & Kjelgård, Kristian Gjertsen (2021). Proceedings, 2021 IEEE Nordic Circuits and Systems Conference (NORCAS). IEEE (Institute of Electrical and Electronics Engineers). ISBN 9781665407120. 220 p. Full text in Research Archive
• Nurmi, Jari; Wisland, Dag T; Aunet, Snorre & Kjelgård, Kristian Gjertsen (2020). Proceedings, Sixth IEEE Nordic Circuits and Systems Conference (NorCAS 2020). IEEE (Institute of Electrical and Electronics Engineers). ISBN 9781728192260. 205 p. Full text in Research Archive Show summary

  On behalf of the Organizing Committee, we would like to welcome all of you to the Sixth IEEE Nordic Circuits and Systems Conference (NorCAS 2020). The conference is a merge of the well-established conferences NORCHIP and the International Symposium on System-on-Chip (SoC). We have a high-quality program with keynotes and papers to be presented. Research covering a wide range of topics within circuits and systems in the digital, analog and mixed domains will be presented. From in total 58 papers submitted, 29 papers were selected for oral presentation in the virtual conference, yielding exactly 50% acceptance rate. There will be four invited speakers who will share their view on emerging key technologies in the circuits and systems field. In the opening session Prof. An-Yeu (Andy) Wu from National Taiwan University will discuss compressive sensing and compressive analytics. Later in the afternoon Prof. Alberto Bosio from ICL, France, will give insights to approximate computing and, in particular, testing of it. In the second morning, Prof. Tim Constandinou from University College London, UK, will present his talk on “Future Human: Merging Minds and Machines.“ The final talk is given by Prof. Alexander Wyglinsky from Worchester Polytechnic Institute, USA, introducing an educational view to Software-Defined Radio. We would like to forward great thanks to IEEE Circuits and Systems Society (CAS) for financial co-sponsoring of the conference. Thanks also to Tampere University and University of Oslo for the efforts on the congress office and virtual platform. We are also thankful to all the Program Committee members and reviewers who have put time and effort into reviewing the submitted papers. Moreover, we are grateful to the NorCAS steering committee for helpful advice and their contribution in the paper selection process. We hope that you will enjoy your time in the virtual conference. We wish you an inspiring conference where your knowledge is increased and friendships are both established and strengthened.

• Ulvestad, Emil; Kjelgård, Kristian Gjertsen; Khanshan, Tohid Moradi; Wisland, Dag T & Lande, Tor Sverre (2018). High-speed Sampling System in CMOS. IEEE (Institute of Electrical and Electronics Engineers). ISBN 9781538676561. 4 p. Full text in Research Archive
• Khanshan, Tohid Moradi; Kjelgård, Kristian Gjertsen; Ulvestad, Emil; Wisland, Dag T & Lande, Tor Sverre (2018). CMOS photosensors for LIDAR. IEEE (Institute of Electrical and Electronics Engineers). ISBN 9781538676561. 4 p. Full text in Research Archive

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• Vogl, Andreas; Wisland, Dag Trygve Eckhoff & Toftevaag, Håvard Hem (2026). Report on technology trends within sensors, photonics and/or chips. doi: https:/be73b2f7-bd89-42de-89f9-7dea3aea2c33.filesusr.com/ugd/21c06c_9e11301bf1144987b90f1d9f8cdb6672.pdf. Full text in Research Archive
• Rahman, Habibur; Recha, Adrian Miguel Llop; Wisland, Dag Trygve Eckhoff & Kjelgård, Kristian Gjertsen (2024). Phase-Tunable CMOS Hybrid Coupler for Dual-Mode Reflection Analysis. Full text in Research Archive
• Hogganvik, Pål Gunnar & Wisland, Dag Trygve Eckhoff (2023). A 2 GHz bandwidth, 6-bit inverter-based open-loop amplifier for high-speed ADCs. Full text in Research Archive
• Amble, Magnus; Aunet, Snorre; Wisland, Dag Trygve Eckhoff & Kjelgård, Kristian Gjertsen (2023). Randomized Bulk-Voltages: A Countermeasure to Mask Side-Channel Leakage of CMOS Logic Gates. Full text in Research Archive
• Kjelgård, Kristian Gjertsen; Nurmi, Jari & Wisland, Dag Trygve Eckhoff (2021). Welcome to NORCAS 2021. IEEE Xplore Digital Library. doi: 10.1109/NorCAS53631.2021.9599644. Full text in Research Archive
• Nurmi, Jari & Wisland, Dag Trygve Eckhoff (2020). Welcome to NORCAS 2020. 2020 IEEE Nordic Circuits and Systems Conference (NorCAS). doi: 10.1109/NorCAS51424.2020.9265140. Full text in Research Archive
• Sjöman, Heikki; Soares, Nazare; Suijkerbuijk, Martinus; Blindheim, Jørgen; Steinert, Martin & Wisland, Dag T (2018). The breathing room - breathing interval and heart rate capturing through ultra low power radar. In Perry, Mark & Cox, Anna (Ed.), Extended Abstracts of the 2018 CHI Conference on Human Factors in Computing Systems. ACM Publications. ISSN 9781450356213. doi: 10.1145/3170427.3186473. Full text in Research Archive
• Tang, Kea-Tiong & Wisland, Dag T (2014). Guest editorial-ISCAS 2013 special issue. IEEE Transactions on Biomedical Circuits and Systems. ISSN 1932-4545. 8(2), p. 153–154. doi: 10.1109/TBCAS.2014.2323855. Full text in Research Archive
• Cao, Tuan Vu; Maier, C.; Wisland, Dag T; Lande, Tor Sverre & Cauwenberghs, G. (2011). Live Demonstration: Energy-Efficient Resonant BFSK MICS Transmitter. Full text in Research Archive
• Cao, Tuan Vu; Wisland, Dag T; Lande, Tor Sverre & Moradi, Farshad (2010). Multi-phase Counting First-Order Frequency-based Delta-Sigma Modulators. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Mahmoodi, Hamid & Cao, Tuan Vu (2009). Improved Write Margin 6T-SRAM for Low Power Applications. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Mahmoodi, Hamid; Peiravi, Ali; Aunet, Snorre & Cao, Tuan Vu (2009). New Subthreshold Concepts in 65nm CMOS Technology. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Mahmoodi, Hamid; Aunet, Snorre; Peiravi, Ali & Cao, Tuan Vu (2009). Ultra Low Power Full Adder Topologies. Full text in Research Archive
• Wisland, Dag T; Aunet, Snorre & Lande, Tor Sverre (2006). Mikroelektronikk for Wireless Sensor Networks. Full text in Research Archive
• Limbodal, Claus; Meisal, Kjetil; Lande, Tor Sverre & Wisland, Dag T (2005). A Spatial RAKE-Receiver for Real-Time UWB-IR Applications. Full text in Research Archive
• Høvin, Mats Erling; Holgersen, Ragnhild & Wisland, Dag T (2005). Cyberhånda underveis. IMPULS_05, Dataforeningen 2005. p. 56–57. Full text in Research Archive
• Øysted, Karianne & Wisland, Dag T (2005). Piezoresistive CMOS-MEMS Pressure Sensor with Ring Oscillator Readout Including Delta-Sigma Analog-to-Digital Converter On-chip. Full text in Research Archive
• Lande, Tor Sverre; Wisland, Dag T; Meisal, Kjetil & Limbodal, Claus (2004). CMOS UWB receivers. Full text in Research Archive
• Wisland, Dag T & Øysted, Karianne (2004). A Fully Integrated CMOS-MEMS Pressure Sensor with On-chip Delta-Sigma Analog-to-Digital Converter. Full text in Research Archive
• Wisland, Dag T & Øysted, Karianne (2004). A Fully Integrated CMOS-MEMS Microphone with On-chip Delta-Sigma Analog-to-Digital Converter. Full text in Research Archive
• Wisland, Dag T; Høvin, Mats Erling & Lande, Tor Sverre (2003). Quantization noise in the first-order non-feedback delta-sigma modulator with DC-input. Full text in Research Archive
• Høvin, Mats Erling; Wisland, Dag T; Berg, Yngvar & Lande, Tor Sverre (2002). A LOW-VOLTAGE SINC2 DECIMATOR IMPLEMENTED BY A NEW CIRCUIT TECHNIQUE USING FLOATING-GATE MOS TRANSISTORS. Full text in Research Archive Show summary

  In this paper we present a new circuit technique making standard CMOS digital circuits able to operate at a power supply voltages below 1 V. This technique is based on lowering the effective transistor threshold voltages by the use of floating-gates, where all the floating gate voltages on the chip are simultaneously programmed by the use of ultra-violet light. A sinc/sup 2/ decimator is implemented in an AMS 0.6 mu m process by this technique.

• Høvin, Mats Erling; Wisland, Dag T; Marienborg, Jan Tore & Lande, Tor Sverre (2002). Delta-sigma modulation in single neurons. Full text in Research Archive Show summary

  In this paper we investigate the relationship between the pulse-coded signal representation found in biological neurons and signals represented by first-order delta-sigma bit-streams. We show that a first-order delta-sigma bit-stream is a digital equivalent to a pulse-coded neural signal. By increasing the clock frequency, a delta-sigma bit-stream can approach a pulse-coded representation with arbitrary accuracy.

• Wisland, Dag T; Høvin, Mats Erling & Lande, Tor Sverre (2002). A Novel Multi-Bit Parallel Delta-Sigma FM-to-Digital Converter with 24-bit Resolution. Full text in Research Archive Show summary

  This paper describes a multi-bit Delta-Sigma FM-to-digital converter (FDC) combining 1024 first-order Delta-Sigma modulators in parallel to increase the signal to quantization-noise ratio (SQNR). This parallelization technique is totally new and according to theory, the SQNR is increased by 6 dB per doubling of number of modulators. The proposed circuit is an extension of the existing frequency delta sigma modulator (FDSM)-concept. The FDSM-concept is based on a Delta-Sigma modulator with no global feedback and thus no need for a feedback DAC, which makes multi-bit conversion straight forward. Theoretical discussions and circuit simulation are presented along with measured results from a 24-bit parallel FDC which has been implemented in a standard 0.6um CMOS process from Austria Micro Systeme AG (AMS). For a 150 Hz bandwidth the measured SQNR is 146 dB with a clock frequency of 20 MHz.

• Wisland, Dag T; Høvin, Mats Erling; Fleischer, Lars A. & Lande, Tor Sverre (2002). A new scalable non-feedback Delta-Sigma Digital-to-Analog Converter. Full text in Research Archive Show summary

  This paper describes a new noise-shaping D/A-converter which in oposite to the conventional Delta-Sigma modulator has no global feedback. The proposed topology is well suited for a pipelined clocking scheme which leads to increased oversampling ratios for both first and higher order modulators. The maximum clock-frequency of the new modulator is limited only by the delay through one single accumulator regardless of modulator order, which represents a huge saving compared to the conventional modulator. The converter is very modular and scales easily to higher modulator orders. Still the proposed topology is mathematically equivalent to the classical Delta-Sigma modulator. Theoretical analysis and circuit simulations for a first-order converter are presented. The circuit has been implemented in a FPGA-circuit from Altera and measured results are presented.

• Wisland, Dag T; Høvin, Mats Erling & Lande, Tor Sverre (2002). A second-order non-feedback Delta-Sigma modulator for D/A conversion. Full text in Research Archive Show summary

  This paper describes a novel second-order noise-shaping Delta-Sigma modulator without the global feedback found in a conventional Delta-Sigma modulator. The proposed topology allows a pipelined clocking scheme which leads to increased speed-potential and thus higher oversampling ratios compared to conventional topologies. The maximum clock-frequency will now be limited only by the delay through one single accumulator regardless of modulator order which represents a huge saving compared to the conventional modulator. Theoretical analysis and system-level simulations for a second-order converter are presented.

• Høvin, Mats Erling; Wisland, Dag T; Berg, Yngvar & Lande, Tor Sverre (2001). A Delta-Sigma Analog-to-Digital Converter Operating at a Power-Supply Voltage of 0.6V. Full text in Research Archive Show summary

  This paper describes a delta-sigma analog-to-digital converter operating at a power supply voltage of 0.6V. The converter is implemented in a standard AMS 0.6um double poly process, and consists of a frequency-delta-sigma modulator where the transistor threshold voltage is decreased by floating-gate techniques.

• Akre, Erlend; Aunet, Snorre; Wisland, Dag Trygve Eckhoff & Kjelgård, Kristian Gjertsen (2023). Ultra Low Power Digital Oscillator with Dynamic Leakage Suppression and compensation In 65nm BULK CMOS and 22nm FDSOI. Universitetet i Oslo, Fysisk Institutt. Full text in Research Archive
• Chen, Yini; Aunet, Snorre & Wisland, Dag Trygve Eckhoff (2023). Frequency Σ ∆ Modulator with ultra-low power supplies towards sub-100 mV. Universitetet i Oslo. Full text in Research Archive Show summary

  This master thesis centers on the exploration of a frequency delta-sigma modulator (FDSM) with ultra-low power supply down to 80 mV for the analog circuitry. The FDSM is configured with ring voltage controlled oscillator (RVCO) serving as the integrator, and two D-flip flops with one as a counter and the other one as a register, finally a differentiator to separate the quantization error from the signal. All components are operated in the subthreshold region as they are supplied with voltages of 80 and 100 mV. Schmitt trigger based logic gates are employed in the entire circuit as the topology is proved to be operational and robust with ultra-low power supply in several sources. This design offers an unconventional solution to ultra-low power supply limitations, by employing an undersampling of the RVCO under an oversampling method of the overall system. Various simulation results are presented in this thesis, as well as the design choices and analysis of the output signal in both time and frequency domain. This design has the potential for applications such as biomedical devices for monitoring heartbeats and blood pressure, as well as sensor interfaces for self-powered IoT products.

• Amble, Magnus; Kjelgård, Kristian Gjertsen; Wisland, Dag Trygve Eckhoff & Aunet, Snorre (2023). Cryptographic hardware resistant to Leakage-Based Differential Power Analysis Attacks. Universitetet i Oslo. Full text in Research Archive
• Moradi, Farshad; Wisland, Dag T; Aunet, Snorre & Berg, Yngvar (2011). Ultra Low Power Digital Circuit Design for Wireless Sensor Network Applications. Universitetet i Oslo. Full text in Research Archive Show summary

  Ny forskning innenfor feltet trådløse sensornettverk åpner for nye og innovative produkter og løsninger. Biomedisinske anvendelser er blant områdene med størst potensial og det investeres i dag betydelige beløp for å bruke denne teknologien for å gjøre medisinsk diagnostikk mer effektiv samtidig som man åpner for fjerndiagnostikk basert på trådløse sensornoder integrert i et ”helsenett”. Målet er å forbedre tjenestekvalitet og redusere kostnader samtidig som brukerne skal oppleve forbedret livskvalitet som følge av økt trygghet og mulighet for å tilbringe mest mulig tid i eget hjem og unngå unødvendige sykehusbesøk og innleggelser. For å gjøre dette til en realitet er man avhengige av sensorelektronikk som bruker minst mulig energi slik at man oppnår tilstrekkelig batterilevetid selv med veldig små batterier. I sin avhandling ” Ultra Low power Digital Circuit Design for Wireless Sensor Network Applications” har PhD-kandidat Farshad Moradi fokusert på nye løsninger innenfor konstruksjon av energigjerrig digital kretselektronikk. Avhandlingen presenterer nye løsninger både innenfor aritmetiske og kombinatoriske kretser, samtidig som den studerer nye statiske minneelementer (SRAM) og alternative minnearkitekturer. Den ser også på utfordringene som oppstår når silisiumteknologien nedskaleres i takt med mikroprosessorutviklingen og foreslår løsninger som bidrar til å gjøre kretsløsninger mer robuste og skalerbare i forhold til denne utviklingen. De viktigste konklusjonene av arbeidet er at man ved å introdusere nye konstruksjonsteknikker både er i stand til å redusere energiforbruket samtidig som robusthet og teknologiskalerbarhet øker. Forskningen har vært utført i samarbeid med Purdue University og vært finansiert av Norges Forskningsråd gjennom FRINATprosjektet ”Micropower Sensor Interface in Nanometer CMOS Technology”.

• Wisland, Dag T (2003). Non-feedback <Delta>-<Sigma> modulators for digital-to-analog conversation. Universitetet i Oslo. Full text in Research Archive

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