A power-efficient, low-distortion variable gain amplifier consisting of coupled differential pairs

Author

van Lieshout, Pieter J G ; Van De Plassche, Rudy J.

Author_Institution

Philips Res. Lab., Eindhoven, Netherlands

Volume

32

Issue

12

fYear

1997

fDate

12/1/1997 12:00:00 AM

Firstpage

2105

Lastpage

2110

Abstract

A variable gain amplifier incorporating a plurality of coupled differential pairs has been designed in a bipolar technology. By applying variable offset voltages to these differential pairs, the overall gain of the system can be varied. The linear input region is inversely proportional to gain, making the amplifier very well suited for automatic gain control circuits. Furthermore, the gain of the proposed amplifier is 0-25 dB, the signal bandwidth is 35 MHz, and the output IP3 is 24-30 dBm. It operates from a 5 V power supply and dissipates 40 mW. The active chip area is 0.15 mm² in a 1 μm bipolar technology

Keywords

automatic gain control; bipolar analogue integrated circuits; differential amplifiers; electric distortion; wideband amplifiers; 0 to 25 dB; 1 micron; 35 MHz; 40 mW; 5 V; AGC circuits; automatic gain control circuits; bipolar technology; coupled differential pairs; low-distortion amplifier; power-efficient amplifier; variable gain amplifier; Bandwidth; Coupling circuits; Differential amplifiers; Gain control; Laboratories; Power supplies; Tail; Transconductance; Transfer functions; Voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.643668

Filename

643668