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A temperature stable CMOS variable gain amplifier with 80-dB linearly controlled gain range

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3 Author(s)
Yamaji, T. ; Corp. R&D Center, Toshiba Corp., Kawasaki, Japan ; Kanou, N. ; Itakura, T.

An IF variable gain amplifier with a quadrature demodulator is fabricated using a 0.25-/spl mu/m CMOS technology. An 80-dB linearly controlled gain range is achieved with exponential voltage-to-current converters using MOS transistors biased in a subthreshold exponential region. To avoid the temperature dependence of the gain control characteristic, a master-slave control technique is adopted for the exponential voltage-to-current converters. The experimental results indicate that the proposed technique is effective for a CMOS VGA.

Published in:

VLSI Circuits, 2001. Digest of Technical Papers. 2001 Symposium on

Date of Conference:

14-16 June 2001