A 100 dB CMRR CMOS operational amplifier with single-supply capability

Author

Ivanov, Vadim ; Zhou, Junlin ; Filanovsky, Igor

Author_Institution

Texas Instruments Inc, Tucson, AZ, USA

fYear

2004

fDate

13-15 Dec. 2004

Firstpage

9

Lastpage

12

Abstract

A CMOS operational amplifier that has a 100 dB CMRR (common mode rejection ratio) is described. This is achieved by combining the high output impedance tail current source with control of the drain-source voltage of the input transistors. The common-mode input signal range includes the negative rail voltage. This is obtained by applying the controlled bulk biasing of both input and cascoding transistors. The amplifier consists of two gain stages connected via cascoded current mirrors with voltage gain boost. The suppression of impact ionization current in the output stage improves the gain by more than 20 dB.

Keywords

CMOS analogue integrated circuits; current mirrors; feedback amplifiers; impact ionisation; operational amplifiers; CMOS operational amplifier; CMRR; amplifier single-supply capability; cascoded current mirrors; cascoding; common mode rejection ratio; common-mode input signal range; high output impedance tail current source; impact ionization current suppression; input transistor drain-source voltage control; local feedback loops; negative rail voltage included input signal range; transistor bulk bias control; voltage gain boost; CMOS technology; Circuits; Feedback loop; Impact ionization; Impedance; Operational amplifiers; Rails; Tail; Threshold voltage; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2004. ICECS 2004. Proceedings of the 2004 11th IEEE International Conference on

Print_ISBN

0-7803-8715-5

Type

conf

DOI

10.1109/ICECS.2004.1399601

Filename

1399601