A Baseband Gain-Controlled Amplifier with a Linear-in-dB Gain Range from 14 dB to 76 dB and a Fixed Corner Frequency DC Offset Canceler

Tadashi ARAI  Tetsuro ITAKURA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.6   pp.909-914
Publication Date: 2004/06/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit and Device Technologies)
Category: 
Keyword: 
gain controlled amplifier,  dc offset canceler,  transconductor,  linearization,  

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Summary: 
A linear-in-dB gain-control amplifier for direct conversion systems employs linearized transconductors in a core amp, a dc offset canceler, and a gain control circuit. The offset compensation circuit achieves a constant corner frequency over a gain range of 14 to 76 dB by simultaneous tuning of the transconductors.