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2007•Microwave and Optical Technology LettersRequires access

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

Hui Dong Lee, Kyung‐Ai Lee, Songcheol Hong

Open publisher page 4 citations

Abstract

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 μm × 620 μm. © 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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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 μm × 620 μm. © 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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Available abstract

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 μm × 620 μm. © 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

Key concepts: Variable-gain amplifier, Video Graphics Array, Wideband, Automatic gain control, CMOS, Electrical engineering, Offset (computer science), Electronic engineering

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