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A fully integrated, untrimmed CMOS instrumentation amplifier with submicrovolt offset

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2 Author(s)
Menolfi, C. ; Integrated Syst. Lab., Fed. Inst. of Technol., Zurich, Switzerland ; Qiuting Huang

A low-noise CMOS instrumentation amplifier intended for low-frequency thermoelectric microsensor applications is presented that achieves submicrovolt offset and noise. Key to its performance is the chopper modulation technique combined with a bandpass filter and a matching on-chip oscillator. No external components or trimming are required. The achievable offset performance depends on the bandpass filter Q and the oscillator-to-bandpass filter matching accuracy. Constraints are derived for an optimum Q and a given matching accuracy. The improvement of common-mode rejection ratio (CMRR) in chopper amplifiers is discussed. The amplifier features a total gain of 77±0.3 dB and a bandwidth of approximately 600 Hz. The measured low-frequency input noise is 8.5 nV/√Hz and the input offset is 600 nV. The measured low-frequency CMRR is better than 150 dB. The circuit has been implemented in a standard 1-μm single-poly CMOS process

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:34 ,  Issue: 3 )