An offset-compensated wide-bandwidth CMOS current-feedback operational amplifier

Author

Djebbi, M. ; Assi, A. ; Sawan, M.

Author_Institution

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

Volume

1

fYear

2003

fDate

4-7 May 2003

Firstpage

73

Abstract

The low-input offset voltage is considered as an important aspect of the performance of an amplifier especially when signals are in the range of few hundreds micro volts. The aim of this paper is to describe a new CMOS current-feedback operational amplifier with an on-chip current-mode input offset voltage compensation. This voltage is due to the mismatch between transistors threshold voltages. In order to reduce the offset voltage, we vary the bias currents of the input buffer as a function of the detected error. Simulation results of the compensated CFOA, using 0.18 μm CMOS process parameters, show a: 50% reduction of the input offset voltage, 71 dB open loop gain, 160 MHz bandwidth, and power consumption less than 1.5 mW from 1.8 V supply voltage.

Keywords

CMOS integrated circuits; bandwidth allocation; buffer circuits; feedback amplifiers; operational amplifiers; transistors; 1.8 V; 160 MHz; 71 dB; CMOS current-feedback operational amplifier; CMOS process parameters; complementary metal-oxide-semiconductor; current bias; harmonic distortion; input buffer; low-input offset voltage; offset-compensated wide-bandwidth amplifier; on-chip current-mode input offset voltage compensation; power consumption; transistor threshold voltages; Bandwidth; Broadband amplifiers; CMOS process; Circuits; Laboratories; MOS devices; Neurofeedback; Operational amplifiers; Threshold voltage; Topology;

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.2003.1226347

Filename

1226347