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A low-noise CMOS instrumentation amplifier for thermoelectric infrared detectors

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

A low-noise CMOS instrumentation amplifier for low-frequency thermoelectric infrared sensor applications is described which uses a chopper technique to reduce low-frequency noise and offset. The offset reduction efficiency of the band-pass filter, implemented to reduce residual offset due to clock feedthrough, has been analyzed and experimentally verified. The circuit has been integrated in a transistor-only 1-μm single-poly n-well CMOS process. It features a gain of 52 dB with a 500 Hz bandwidth and a common-mode rejection ratio (CMRR) of more than 70 dB. The equivalent input low frequency noise is 15 nV/√Hz. The typical residual input offset is 1.5 μV. The amplifier power consumption is 1.3 mW

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:32 ,  Issue: 7 )

Date of Publication:

Jul 1997

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