Title :
Auto Correction Feedback for ripple suppression in a chopper amplifier
Author :
Kusuda, Yoshinori
Author_Institution :
Analog Devices, Inc., Wilmington, MA, USA
Abstract :
This paper proposes a local feedback, named auto correction feedback (ACFB), used in a chopper amplifier to suppress its offset related ripple. It nulls out amplifier´s offset in DC domain which would otherwise become modulated ripple at the chopper amplifier´s output, instead of filtering the ripple by a post filter. The proposed chopper amplifier with the ACFB achieves 45 dB ripple attenuation without introducing noise penalty, which has been proved by both simulation and measurement.
Keywords :
amplifiers; choppers (circuits); feedback; auto correction feedback; chopper amplifier; ripple suppression; Choppers; Feedback circuits; Filters; Frequency; High power amplifiers; Noise measurement; Output feedback; Timing; Transconductance; Voltage;
Conference_Titel :
Custom Integrated Circuits Conference, 2009. CICC '09. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-4071-9
Electronic_ISBN :
978-1-4244-4073-3
DOI :
10.1109/CICC.2009.5280772
