Extending voltage-mode op amps to current-mode performance

Author

Toumazou, C. ; Lidgey, F.J. ; Makris, C.A.

Author_Institution

Dept. of Electr. Eng., Imperial Coll. of Sci., Technol. & Med., London, UK

Volume

137

Issue

2

fYear

1990

fDate

4/1/1990 12:00:00 AM

Firstpage

116

Lastpage

130

Abstract

The authors review techniques for extending the output capabilities of conventional voltage-mode operational amplifiers to achieve current-mode performance. Tracing the development over the past two decades, a number of elegant and useful circuit topologies for realising amplifiers with controlled current output properties are described. In particular, the operational amplifier supply current sensing technique and its application to current follower and current conveyor circuit implementations is examined. The authors then view their work, based on enhancing the performance of conventional voltage-mode amplifier designs by application of these current-mode alternatives. A high performance follower based amplifier, a biquadratic filter section, a precision full-wave rectifier and an instrumentation amplifier based upon enhancement to the voltage operational amplifier are shown to outperform their conventional counterparts

Keywords

CMOS integrated circuits; linear integrated circuits; network topology; operational amplifiers; CMOS IC; biquadratic filter section; circuit topologies; current conveyor; current feedback; current follower; current-mode performance; full-wave rectifier; instrumentation amplifier; output capabilities; push-pull output stage; voltage-mode op amps;

fLanguage

English

Journal_Title

Circuits, Devices and Systems, IEE Proceedings G

Publisher

iet

ISSN

0956-3768

Type

jour

Filename

217055