A CMOS wideband linear-in-dB VGA for UWB applications

A CMOS wideband variable gain amplifier (VGA) with an exponential gain control characteristic is presented. The exponential gain control function is realized by changing the tail currents a differential gain stage. The bandwidth is extended by using an inductive peaking technique. The gain (in dB) of the VGA is varied linearly from -41 dB to 31 dB with respect to a control voltage from 1.38 V to 1.1 V. The bandwidth of the proposed VGA is larger than 1 GHz with a gain control range of 72 dB. A DC offset cancellation loop is included so as to avoid amplification of the DC offset. The VGA is powered by 1. 8 V with 13.5 mA. The VGA chip occupies an area of 220 mu m X 620 mu m. (c) 2007 Wiley Periodicals, Inc.
Publisher
JOHN WILEY & SONS INC
Issue Date
2007-04
Language
ENG
Keywords

VARIABLE GAIN AMPLIFIER

Citation

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, v.49, no.4, pp.812 - 817

ISSN
0895-2477
DOI
10.1002/mop.22278
URI
http://hdl.handle.net/10203/4050
Appears in Collection
EE-Journal Papers(저널논문)
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