A 2-6.5 GHz CMOS variable gain amplifier for vector-sum phase shifters
A wideband CMOS variable gain amplifier (VGA) for application in vector-sum phase shifters is presented. The VGA exhibits a continous, linear-in-magnitude gain control curve by using a programmable transconductance multiplier. Wideband input matching is achieved by employing the common-gate configur...
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Published in | 2012 Asia Pacific Microwave Conference Proceedings pp. 94 - 96 |
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Main Authors | , |
Format | Conference Proceeding |
Language | English |
Published |
IEEE
01.12.2012
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Subjects | |
Online Access | Get full text |
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Summary: | A wideband CMOS variable gain amplifier (VGA) for application in vector-sum phase shifters is presented. The VGA exhibits a continous, linear-in-magnitude gain control curve by using a programmable transconductance multiplier. Wideband input matching is achieved by employing the common-gate configuration at the input stage. To improve the gain flatness and the output matching, a modified three-stage Cherry-Hooper amplifier with inductive peaking is proposed. Using a standard 0.13-μm CMOS process, the measured 3-dB bandwidth is from 2 to 6.5 GHz with a linear-in-magnitude gain tuning range of 14 dB, and transmission phase error less than 4°. Operating at 1.2 V, the chip consumes 6 mW and occupies 0.6 mm 2 including test pads. |
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ISBN: | 1457713306 9781457713309 |
ISSN: | 2165-4727 2165-4743 |
DOI: | 10.1109/APMC.2012.6421509 |