Title :
A CMOS chopper amplifier
Author :
Enz, Christian C. ; Vittoz, Eric A. ; Krummenacher, François
fDate :
6/1/1987 12:00:00 AM
Abstract :
A highly sensitive CMOS chopper amplifier for low-frequency applications is described. It is realized with a second-order low-pass selective amplifier using a continuous-time filtering technique. The circuit has been integrated in a 3-μm p-well CMOS technology. The chopper amplifier DC grain is 38 dB with a 200-Hz bandwidth. The equivalent input noise is 63 nV/√Hz and free from 1/f noise. The input offset is below 5 μV for a tuning error less than 1%. The amplifier consumes only 34 μW.
Keywords :
Amplifiers; CMOS integrated circuits; Choppers (circuits); amplifiers; choppers (circuits); Bandwidth; CMOS technology; Choppers; Circuit noise; Energy consumption; Frequency; Low-frequency noise; Low-noise amplifiers; Noise level; Phase noise;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.1987.1052730
