A Wideband CMOS Variable Gain Amplifier With an Exponential Gain Control

A CMOS wideband cascaded variable gain amplifier (VGA) with a temperature-independent exponential gain control characteristic is presented in this paper. The exponential gain control function is realized using parasitic bipolar transistors and a control signal converter. The bandwidth is extended using an inductive peaking technique for high-frequency operations. The gain of the VGA varies from 38.8 to 55.3 dB in relation to the control voltage that varies from 0 to 1.8 V. The bandwidth of the proposed VGA is approximately 900 MHz with a gain control range of 94.1 dB. The proposed VGA includes a dc offset cancellation loop to avoid amplification of the dc offset. TheVGAis powered by 1.8 V with 11.4 mA. The VGA chip including bondpads occupies an area of 850 m 490 m.
Publisher
IEEE
Issue Date
2007-06-01
Keywords

CMOS analog integrated circuit; gain control; linear-in-decibel gain characteristic; temperature compensation; variable gain amplifier (VGA); wideband systems

Citation

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 55, NO. 6, pp.1363-1373

ISSN
0018-9480
URI
http://hdl.handle.net/10203/1578
Appears in Collection
EE-Journal Papers(저널논문)
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