Title :
A CMOS Chopper Offset-Stabilized Opamp
Author :
Witte, Johan F. ; Makinwa, Kofi A A ; Huijsing, Johan H.
Author_Institution :
DIMES, Delft Univ. of Technol.
Abstract :
In this paper we introduce an offset-stabilized operational amplifier that uses a chopper amplifier in a low frequency path to cancel the offset of a wide-bandwidth amplifier. A sample-and-hold circuit is used to reduce the chopper ripple, and the low frequency path is also offset-stabilized to further reduce the residual offset. The amplifier has 1muV offset at a 4 kHz chopper frequency, and a unity gain frequency of 1.3MHz with a 50pF load. The amplifier was realized in a 0.7mum CMOS process, and has an effective chip area of 3.6mm2
Keywords :
CMOS integrated circuits; operational amplifiers; sample and hold circuits; 0.7 micron; 1 muV; 1.3 MHz; 4 kHz; 50 pF; CMOS process; chopper amplifier; offset-stabilized operational amplifier; sample-and-hold circuit; wide-bandwidth amplifier; Bandwidth; Broadband amplifiers; CMOS technology; Choppers; Circuits; Frequency; Low-frequency noise; Low-noise amplifiers; Operational amplifiers; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 2006. ESSCIRC 2006. Proceedings of the 32nd European
Conference_Location :
Montreux
Print_ISBN :
1-4244-0303-0
DOI :
10.1109/ESSCIR.2006.307605
