An all CMOS 84dB-linear low-power variable gain amplifier

An all CMOS 84dB-linear low-power variable gain amplifier

A new exponential approximation function is implemented into a variable gain amplifier (VGA). The newly proposed VGA topology provides low-power, small chip size, and wide control gain range. The VGA is fabricated in 0.18/spl mu/m CMOS technology and measurements show a gain variation of more than 8...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Quoc-Hoang Duong, Le-Quan, Sang-Gug Lee
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Circuits
CMOS technology
Dynamic range
Gain control
Linearity
Medical control systems
Power dissipation
Taylor series
Telecommunication control
Topology
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Beschreibung
Zusammenfassung:A new exponential approximation function is implemented into a variable gain amplifier (VGA). The newly proposed VGA topology provides low-power, small chip size, and wide control gain range. The VGA is fabricated in 0.18/spl mu/m CMOS technology and measurements show a gain variation of more than 84dB in two cascaded stages, and 80dB-linear range with a linearity error of less than /spl plusmn/1dB. The PldB varies from -42dBm to -22dBm. The power dissipation is less than 3.6mA from 1.8V supply. The chip excluding bondpads occupies 0.4mm/sup 2/.
ISSN:2158-5601
2158-5636
DOI:10.1109/VLSIC.2005.1469346