Philipp Dominik Häfliger

• Roy, Avisek; Marchetti, Luca; Azadmehr, Mehdi; Häfliger, Philipp; Ta, Bao Quoc & Aasmundtveit, Knut (2020). Characterization of Polysilicon Microstructures to Estimate Local Temperature on CMOS Chips, In  2020 IEEE 8th Electronics System-Integration Technology Conference (ESTC).  IEEE.  ISBN 978-1-7281-6293-5.  Conference Paper. Vis sammendrag

  The measurement of local temperature on application specific integrated circuits (ASICs) can be used to determine the reliability of electronics implemented on the chip. For this reason, we propose a simple method to monitor the temperature on CMOS by using polysilicon microstructures realized in AMS 350 nm technology. The surrounding temperature on a CMOS chip was extracted from four-probe resistance measurement of two polysilicon microstructures fabricated during the IC manufacturing process. Electrical characterization of these microstructures was performed within 25 to 400 ˚C for using them as on-chip temperature sensors. The sensors were tested with in-built CMOS microheaters as heat source. Results show that an IC temperature ranging from room-temperature to 200 ˚C can be estimated with a deviation below 2 ˚C between the two sensors, while the deviation increases with higher temperature. Overall, the proposed method is simple and requires minimal measurement setup to monitor the temperature on ICs.

• Subbarao, Girish Aramanekoppa & Häfliger, Philipp (2020). Design and Comparison of Synthesizable Fair Asynchronous Arbiter, In Mohamad Sawan & Mounir Boukadoum (ed.),  Annual IEEE Northeast Workshop on Circuits and Systems.  IEEE.  ISBN 978-1-4673-0859-5.  paper.  s 122 - 125
• Nematzadeh, Mozhdeh; Häfliger, Philipp Dominik; Samadpoor Rikan, Behnam; Nøvik, Steffen & Østby, Joar Martin (2019). Low Noise Combined Optical-Chemical CMOS Sensor For Biomedical Application. The ... Midwest Symposium on Circuits and Systems conference proceedings.  ISSN 1548-3746.  2019-August, s 394- 398 . doi: 10.1109/MWSCAS.2019.8885280
• Roy, Avisek; Azadmehr, Mehdi; Häfliger, Philipp; Ta, Bao Quoc & Aasmundtveit, Knut Eilif (2019). Direct Synthesis of Carbon Nanotubes in CMOS-Layout of Micro-heaters. IEEE International Conference on Nanotechnology.  ISSN 1944-9399.  2018-July, s 1- 4 . doi: 10.1109/NANO.2018.8626363 Fulltekst i vitenarkiv. Vis sammendrag

  Direct integration of Carbon Nanotubes (CNTs) in CMOS is important for commercially manufacturing low-cost CNT-based sensors. In such compact sensors, CNTs would act as sensing element, and CMOS circuits would process relevant signals from the CNTs. CNTs can be directly synthesized and integrated into CMOS by local thermal chemical vapor deposition (CVD), where a hot spot of 900 °C can be generated by CMOS micro-heaters. However, a sufficient thermal gradient between the micro-heaters and nearest CMOS devices is a prerequisite to ensure non-destructive temperature (<300 °C) in the electronic circuit regions. Our previous works have shown modelling and simulation of various CMOS micro-heaters that are promising for fulfilling these temperature requirements. In this paper, we investigate the layout designs of different metal and polysilicon micro-heaters using AMS 0.35μm CMOS process. Optical micrographs of the fabricated micro-heaters are also presented.

• Roy, Avisek; Azadmehr, Mehdi; Ta, Bao Quoc; Häfliger, Philipp & Aasmundtveit, Knut (2019). Design and fabrication of CMOS microstructures to locally synthesize carbon nanotubes for gas sensing. Sensors.  ISSN 1424-8220.  19(19) . doi: 10.3390/s19194340 Fulltekst i vitenarkiv. Vis sammendrag

  Carbon nanotubes (CNTs) can be grown locally on custom-designed CMOS microstructures to use them as a sensing material for manufacturing low-cost gas sensors, where CMOS readout circuits are directly integrated. Such a local CNT synthesis process using thermal chemical vapor deposition (CVD) requires temperatures near 900 °C, which is destructive for CMOS circuits. Therefore, it is necessary to ensure a high thermal gradient around the CNT growth structures to maintain CMOS-compatible temperature (below 300 °C) on the bulk part of the chip, where readout circuits are placed. This paper presents several promising designs of CNT growth microstructures and their thermomechanical analyses (by ANSYS Multiphysics software) to check the feasibility of local CNT synthesis in CMOS. Standard CMOS processes have several conductive interconnecting metal and polysilicon layers, both being suitable to serve as microheaters for local resistive heating to achieve the CNT growth temperature. Most of these microheaters need to be partially or fully suspended to produce the required thermal isolation for CMOS compatibility. Necessary CMOS post-processing steps to realize CNT growth structures are discussed. Layout designs of the microstructures, along with some of the microstructures fabricated in a standard AMS 350 nm CMOS process, are also presented in this paper.

• Farian, Lukasz; Häfliger, Philipp & Leñero-Bardallo, Juan Antonio (2018). A Miniaturized Two-Axis Ultra Low Latency and Low-Power Sun Sensor for Attitude Determination of Micro Space Probes. IEEE Transactions on Circuits and Systems I: Regular Papers.  ISSN 1549-8328.  65(5), s 1543- 1554 . doi: 10.1109/TCSI.2017.2763990
• Buccino, Alessio Paolo; Hagen, Espen; Einevoll, Gaute; Häfliger, Philipp & Cauwenberghs, Gert (2018). Independent Component Analysis for Fully Automated Multi-Electrode Array Spike Sorting, In Nigel Lovell (ed.),  Annual Conference of the IEEE Engineering in Medicine and Biology Society.  IEEE conference proceedings.  ISBN 9781538636473.  paper.  s 2627 - 2630
• Buccino, Alessio Paolo; Kordovan, Michael; Ness, Torbjørn V; Merkt, Benjamin; Häfliger, Philipp; Fyhn, Marianne; Cauwenberghs, Gert; Rotter, Stefan & Einevoll, Gaute (2018). Combining biophysical modeling and deep learning for multielectrode array neuron localization and classification. Journal of Neurophysiology.  ISSN 0022-3077.  120(3), s 1212- 1232 . doi: 10.1152/jn.00210.2018 Fulltekst i vitenarkiv.

Se alle arbeider i Cristin

• Häfliger, Philipp (2020). Introduction : The 3D-MUSE project.
• Häfliger, Philipp & Mikkelsen, Mikkel (2020). Ultra dense 3D integrated circuits and pixel parallel pro- cessing image sensors.

Se alle arbeider i Cristin