A nested-chopped current-feedback instrumentation amplifier for MEMS flow sensors

Moaaz Ahmed; Saqib Mohamad; Amine Bermak

doi:10.1109/MWSCAS.2016.7869997

A nested-chopped current-feedback instrumentation amplifier for MEMS flow sensors

Moaaz Ahmed, Saqib Mohamad, Amine Bermak

CSE Information & Computing Technology

Hong Kong University of Science and Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

3 Citations (Scopus)

Abstract

A nested chopped current-feedback instrumentation amplifier (CFIA) designed for micro-fluidic applications is reported in this work. The proposed CFIA is chopped at 50kHz to bring input-referred offset below 12 μV and flicker-noise corner around 100mHz. In order to further suppress the residue offset to nV-level, the CFIA is again chopped with a slower clock of 500Hz to achieve an input-referred offset of 149nV. The CMOS readout interface for MEMS flow sensor achieves a thermal-noise power spectral density of 4.34nV √ Hz for realizing over 12- bits dynamic range. Implemented in chartered 0.18 μm CMOS process, the CFIA draws 522 μ A supply current and achieves an excellent noise efficiency factor (NEF) of 3.82 which is the lowest ever reported with CFIAs.

Original language	English
Title of host publication	2016 IEEE 59th International Midwest Symposium on Circuits and Systems, MWSCAS 2016
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781509009169
DOIs	https://doi.org/10.1109/MWSCAS.2016.7869997
Publication status	Published - 2 Jul 2016
Event	59th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2016 - Abu Dhabi, United Arab Emirates Duration: 16 Oct 2016 → 19 Oct 2016

Publication series

Name	Midwest Symposium on Circuits and Systems
Volume	0
ISSN (Print)	1548-3746

Conference

Conference	59th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2016
Country/Territory	United Arab Emirates
City	Abu Dhabi
Period	16/10/16 → 19/10/16

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10.1109/MWSCAS.2016.7869997

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Ahmed, M., Mohamad, S., & Bermak, A. (2016). A nested-chopped current-feedback instrumentation amplifier for MEMS flow sensors. In 2016 IEEE 59th International Midwest Symposium on Circuits and Systems, MWSCAS 2016 Article 7869997 (Midwest Symposium on Circuits and Systems; Vol. 0). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/MWSCAS.2016.7869997

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Ahmed, M, Mohamad, S & Bermak, A 2016, A nested-chopped current-feedback instrumentation amplifier for MEMS flow sensors. in 2016 IEEE 59th International Midwest Symposium on Circuits and Systems, MWSCAS 2016., 7869997, Midwest Symposium on Circuits and Systems, vol. 0, Institute of Electrical and Electronics Engineers Inc., 59th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2016, Abu Dhabi, United Arab Emirates, 16/10/16. https://doi.org/10.1109/MWSCAS.2016.7869997

A nested-chopped current-feedback instrumentation amplifier for MEMS flow sensors. / Ahmed, Moaaz; Mohamad, Saqib; Bermak, Amine.
2016 IEEE 59th International Midwest Symposium on Circuits and Systems, MWSCAS 2016. Institute of Electrical and Electronics Engineers Inc., 2016. 7869997 (Midwest Symposium on Circuits and Systems; Vol. 0).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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N2 - A nested chopped current-feedback instrumentation amplifier (CFIA) designed for micro-fluidic applications is reported in this work. The proposed CFIA is chopped at 50kHz to bring input-referred offset below 12 μV and flicker-noise corner around 100mHz. In order to further suppress the residue offset to nV-level, the CFIA is again chopped with a slower clock of 500Hz to achieve an input-referred offset of 149nV. The CMOS readout interface for MEMS flow sensor achieves a thermal-noise power spectral density of 4.34nV √ Hz for realizing over 12- bits dynamic range. Implemented in chartered 0.18 μm CMOS process, the CFIA draws 522 μ A supply current and achieves an excellent noise efficiency factor (NEF) of 3.82 which is the lowest ever reported with CFIAs.

AB - A nested chopped current-feedback instrumentation amplifier (CFIA) designed for micro-fluidic applications is reported in this work. The proposed CFIA is chopped at 50kHz to bring input-referred offset below 12 μV and flicker-noise corner around 100mHz. In order to further suppress the residue offset to nV-level, the CFIA is again chopped with a slower clock of 500Hz to achieve an input-referred offset of 149nV. The CMOS readout interface for MEMS flow sensor achieves a thermal-noise power spectral density of 4.34nV √ Hz for realizing over 12- bits dynamic range. Implemented in chartered 0.18 μm CMOS process, the CFIA draws 522 μ A supply current and achieves an excellent noise efficiency factor (NEF) of 3.82 which is the lowest ever reported with CFIAs.

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A nested-chopped current-feedback instrumentation amplifier for MEMS flow sensors

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