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A 380-MHz CMOS linear-in-dB signal-summing variable gain amplifier with gain compensation techniques for CDMA systems

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4 Author(s)
Watanabe, O. ; Corporate R&D Center, Toshiba Corp., Kawasaki, Japan ; Otaka, S. ; Ashida, M. ; Itakura, T.

A linear-in-dB signal-summing Variable Gain Amplifier (VGA) is fabricated in 0.25 /spl mu/m CMOS technology. Two gain compensation techniques are proposed in order to compensate the gain deviations due to the MOSFET characteristic which has a square-law characteristic or an exponential-law characteristic determined by its current density. Temperature compensation techniques are also proposed. A gain range of 80 dB, a gain error of within /spl plusmn/3 dB, an NF of 11 dB are obtained at 380 MHz by measurement.

Published in:

VLSI Circuits Digest of Technical Papers, 2002. Symposium on

Date of Conference:

13-15 June 2002