✦ LIBER ✦

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

✍ Scribed by Hui Dong Lee; Kyung-Ai Lee; Songcheol Hong

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 472 KB
Volume: 49
Category: Article
ISSN: 0895-2477
DOI: 10.1002/mop.22278

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✦ Synopsis

Abstract

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 μ__m__ × 620 μ__m__. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 812–817, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22278

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