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

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, maki...

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Bibliographic Details
Published inIEEE journal of solid-state circuits Vol. 32; no. 12; pp. 2105 - 2110
Main Authors van Lieshout, P.J.G., van de Plassche, R.J.
Format Journal Article
LanguageEnglish
Published IEEE 01.12.1997
Subjects
Bandwidth
Coupling circuits
Differential amplifiers
Gain control
Laboratories
Power supplies
Tail
Transconductance
Transfer functions
Voltage
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Summary: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 mm/sup 2/ in a 1 /spl mu/m bipolar technology.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0018-9200
1558-173X
DOI:10.1109/4.643668