A low-power 900 mV rail-to-rail class-AB operational amplifier

Author

Hu, Yamu ; Sawan, Mohamad

Author_Institution

Dept. of Electr. Eng., Ecole Polytech. de Montreal, Que., Canada

Volume

1

fYear

2003

fDate

4-7 May 2003

Firstpage

171

Abstract

In this paper, we proposed a novel rail-to-rail CMOS opamp that uses a native NMOS input stage to replace conventional PMOS pair. A simple current regulation circuit, which takes advantage of weak inversion mode, is proposed to obtain constant Gm in the entire common mode range. In addition, a class-AB output buffer, which consists of two float current sources, is employed to obtain a wide output range. The designed opamp is dedicated to low frequency 900 mV applications. It features with a DC gain of 84 dB and bandwidth of 122 kHz, while consumes power only 2.2 μW. The dynamic range of opamp is from 50 mV to 850 mV. The simulation result also shows that the proposed opamp is able to work under a voltage as low as 600 mV.

Keywords

CMOS analogue integrated circuits; buffer circuits; low-power electronics; operational amplifiers; 122 kHz; 2.2 muW; 500 to 850 mV; 84 dB; 900 mV; NMOS; class-AB output buffer; common mode range; current regulation circuit; dynamic range; float current sources; operational amplifier; rail-to-rail CMOS opamp; Bandwidth; Circuits; Current control; Frequency; Gain; MOS devices; Operational amplifiers; Rail to rail amplifiers; Rail to rail inputs; Rail to rail operation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 2003. IEEE CCECE 2003. Canadian Conference on

ISSN

0840-7789

Print_ISBN

0-7803-7781-8

Type

conf

DOI

10.1109/CCECE.2003.1226370

Filename

1226370