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논문 기본 정보

자료유형
학술저널
저자정보
Yoon-Jee Kim (Pohang University of Science and Technology (POSTECH)) Jaehyun Park (Pohang University of Science and Technology (POSTECH)) Byungsub Kim (Pohang University of Science and Technology (POSTECH)) Jae-Yoon Sim (Pohang University of Science and Technology (POSTECH)) Hong-June Park (Pohang University of Science and Technology (POSTECH))
저널정보
대한전자공학회 IEIE Transactions on Smart Processing & Computing IEIE Transactions on Smart Processing & Computing Vol.9 No.5
발행연도
2020.10
수록면
405 - 412 (8page)
DOI
10.5573/IEIESPC.2020.9.5.405

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초록· 키워드

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A fully differential readout integrated circuit (ROIC) is proposed to enhance SNR by using a micro electro mechanical system (MEMS) microphone pair. A differential clock is AC-coupled to the MEMS microphone pair as AC bias for chopper operation, while maintaining a high-voltage DC bias through high-resistance resistors for high sensitivity. The MEMS microphone pair connected to the fully differential ROIC amplifier with a demodulation chopper increased the measured SNRAW by 3.5~4.3dB compared to a single MEMS microphone with a chopper. The chopper operation applied to the pair of MEMS microphones reduced the measured audio band noise at the ROIC output by 14.8~16.5 times, compared to the no-chopper case. The fully differential ROIC consists of an amplifier, a demodulation chopper, a pair of resistor-capacitor low pass filters (RC-LPFs) and a unity-gain buffer. The ROIC implemented in a 0.35μm CMOS process takes a chip area of 2.5mm² and consumes 134μA at a supply voltage of 3.3V.

목차

Abstract
1. Introduction
2. Proposed Architecture
3. ROIC Implementation
4. Measurement Results
5. Conclusion
References

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