Title :
A low-noise CMOS instrumentation amplifier for thermoelectric infrared detectors
Author :
Menolfi, Christian ; Huang, Qiuting
Author_Institution :
Integrated Syst. Lab., Swiss Federal Inst. of Technol., Zurich, Switzerland
fDate :
7/1/1997 12:00:00 AM
Abstract :
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
Keywords :
CMOS analogue integrated circuits; equivalent circuits; infrared detectors; instrumentation amplifiers; integrated circuit noise; thermoelectric devices; 1 micron; 1.3 mW; 500 Hz; 52 dB; amplifier power consumption; chopper technique; clock feedthrough; common-mode rejection ratio; equivalent input low frequency noise; low-frequency noise; low-noise CMOS instrumentation amplifier; offset reduction efficiency; residual offset; single-poly n-well CMOS process; thermoelectric infrared detectors; Band pass filters; CMOS process; Choppers; Circuits; Clocks; Infrared sensors; Instruments; Low-frequency noise; Low-noise amplifiers; Thermoelectricity;
Journal_Title :
Solid-State Circuits, IEEE Journal of
