Title :
A 0.06mm2 14nV/√Hz chopper instrumentation amplifier with automatic differential-pair matching
Author :
Akita, I. ; Ishida, Makoto
Author_Institution :
Toyohashi Univ. of Technol., Toyohashi, Japan
Abstract :
A small-area low-power low-noise instrumentation amplifier (IA) is desired in arrayed sensor devices that are used for high-spatial-resolution biomedical and environment monitoring systems. This paper presents a 0.06mm2 chopper-stabilized current-feedback IA with 13.5nV/√Hz input-referred noise and less than 3.5μV offset voltage. For significantly reducing the ripple due to chopping, the proposed IA uses a novel digital calibration scheme, namely, automatic differential-pair matching (ADPM), which enables a small die area and low-power operation. The proposed IA is implemented in a standard 0.18μm CMOS and achieves a noise efficiency factor (NEF) of 7.2 while drawing 194μA. The active area of the IA is 7.8× smaller than that of the state-of-the-art [1-5] while it maintains low output ripple, low noise, and low power.
Keywords :
CMOS analogue integrated circuits; calibration; choppers (circuits); circuit feedback; circuit stability; instrumentation amplifiers; low-power electronics; ADPM; NEF; arrayed sensor devices; automatic differential-pair matching; chopper instrumentation amplifier; chopper-stabilized current-feedback IA; current 194 muA; die area; digital calibration scheme; environment monitoring systems; high-spatial-resolution biomedical system; low-power operation; noise efficiency factor; ripple reduction; size 0.18 mum; small-area low-power low-noise instrumentation amplifier; standard CMOS process; Calibration; Detectors; Instruments; MOSFET; Noise; Voltage measurement;
Conference_Titel :
Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2013 IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4673-4515-6
DOI :
10.1109/ISSCC.2013.6487689
