Title :
A CMOS Chopper Amplifier
Author :
Enz, C.C. ; Vittoz, E.A. ; Krummenacher, F.
Author_Institution :
Ecole Polytechnique Fédérale, Laboratoire d´´Ã©lectronique générale, 33, Av. de Cour, 1007 LAUSANNE SWITZERLAND
Abstract :
This paper presents a CMOS chopper amplifier realized with a 2nd order low-pass selective amplifier, using continuous-time filtering technique. The circuit has been integrated in a 3 ¿m p-well low-voltage CMOS technology. The chopper DC gain is 32 dB with 200 Hz bandwidth. The equivalent low-frequency input noise is 63 nV/¿Hz and free from 1/f noise. The input offset is typically 5 ¿V. The amplifier consumes only 34 ¿W and is therefore well suited for biomedical applications, like electrogram amplification.
Keywords :
Broadband amplifiers; CMOS technology; Choppers; Differential amplifiers; Frequency; Low-frequency noise; Low-noise amplifiers; Noise reduction; Power harmonic filters; White noise;
Conference_Titel :
Solid-State Circuits Conference, 1986. ESSCIRC '86. Twelfth European
Conference_Location :
Delft, The Netherlands
