A 0.5V fully differential OTA with local common feedback

Author

He, Xiao-yong ; Pun, Kong-Pang ; Choy, Chiu-Sing ; Chan, Cheong-Fat

Author_Institution

Dept of Electron. Eng., Chinese Univ. of Hong Kong

fYear

2006

fDate

21-24 May 2006

Lastpage

1562

Abstract

This paper presents a fully differential OTA with a supply of 0.5V in a 0.18mum CMOS process that has threshold voltages of 0.5V under zero body-source biasing. Unlike a recent two-stage 0.5V OTA architecture, this OTA employs two common mode feedback loops for obtaining a stable operating condition and thus a robust performance against process variations. Body terminals of the input differential pairs of each stage are used for common mode control. Simulation results indicate that this OTA has an open-loop gain of greater than 61dB, a unity gain-bandwidth of 41MHz with a load of 10pF. The power consumption is 510muW

Keywords

CMOS analogue integrated circuits; circuit feedback; differential amplifiers; operational amplifiers; 0.18 micron; 0.5 V; 41 MHz; 510 muW; CMOS process; common mode control; common mode feedback loops; differential operational transconductance amplifiers; zero body-source biasing; CMOS process; Circuits; Energy consumption; Equations; Feedback loop; Frequency; Low voltage; Performance gain; Robustness; Threshold voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on

Conference_Location

Island of Kos

Print_ISBN

0-7803-9389-9

Type

conf

DOI

10.1109/ISCAS.2006.1692896

Filename

1692896