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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Bibliographic Details
Published in2012 Asia Pacific Microwave Conference Proceedings pp. 94 - 96
Main Authors Hu Zijie, Mouthaan, K.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.12.2012
Subjects
CMOS integrated circuits
CMOS wideband variable gain amplifier
Gain
Impedance matching
linear-in-magnitude
Phase shifters
Transconductance
Transistors
vector-sum phase shifters
Voltage control
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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.
ISBN:1457713306
9781457713309
ISSN:2165-4727
2165-4743
DOI:10.1109/APMC.2012.6421509