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A variable gain CMOS amplifier with exponential gain control

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1 Author(s)
Mangelsdorf, C.W. ; Analog Devices, Tokyo, Japan

A variable gain amplifier architecture suitable for foundry CMOS is constructed using linearized transconductance blocks. The use of a four-transistor transconductance cell allows for wider gain range and larger signal swing under low supply conditions than the simple differential pair used in previous work. Experimental results with 0.6 /spl mu/m CMOS show -5 to 35 dB gain and 20 MHz bandwidth at 21 mW.

Published in:

VLSI Circuits, 2000. Digest of Technical Papers. 2000 Symposium on

Date of Conference:

15-17 June 2000