Title :
A CMOS instrumentation amplifier with 600 nV offset, 8.5 nV/√(Hz) noise and 150 dB CMRR
Author :
Menolfi, Christian ; Huang, Qiuting
Author_Institution :
Integrated Syst. Lab., Fed. Inst. of Technol., Zurich, Switzerland
Abstract :
A low noise CMOS instrumentation amplifier for thermopile sensor applications uses chopper technique, combined with a bandpass filter matched to an on-chip oscillator, to achieve sub-microvolt offset and noise. the amplifier features a total gain of 77 dB±0.3 dB and a bandwidth of 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. No external components or trimming are required. The circuit has been implemented in a standard 1 μm single-poly CMOS process
Keywords :
CMOS analogue integrated circuits; band-pass filters; choppers (circuits); instrumentation amplifiers; integrated circuit measurement; integrated circuit noise; microsensors; thermopiles; 1 micron; 600 Hz; 600 nV; 76.7 to 77.3 dB; CMOS instrumentation amplifier; CMRR; bandpass filter; chopper technique; low frequency input noise; single-poly CMOS process; sub-microvolt offset; thermopile sensor applications; total gain; Band pass filters; Bandwidth; Choppers; Frequency measurement; Instruments; Low-frequency noise; Low-noise amplifiers; Oscillators; Sensor phenomena and characterization; Thermal sensors;
Conference_Titel :
Custom Integrated Circuits Conference, 1998. Proceedings of the IEEE 1998
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-4292-5
DOI :
10.1109/CICC.1998.695001
