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Low-voltage compact CMOS variable gain amplifier
Author(s)
Thanachayanont, Apinunt
Date Issued
June 2, 2008
Type
Article
Abstract
A compact low-power low-voltage CMOS variable gain amplifier (VGA) is proposed. The proposed circuit merges a source-degenerated transconductance amplifier with a current-mode transimpedance amplifier, which renders voltage gain control with constant bandwidth. Coarse gain tuning is achieved by using a switched-resistor network, while fine gain tuning is obtained by using a voltage-controlled active resistor. A two-stage VGA was fabricated in a 0.35 μ m CMOS technology. Experimental results show that the prototype VGA has a gain range of 40 dB with more than 10 MHz bandwidth, while draining only 600 μ A from a 1.5 V supply voltage. © 2007 Elsevier GmbH. All rights reserved.
Citation
AEU International Journal of Electronics and Communications, 62(6), 413-420, 2008