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A digitally controlled dB-linear CMOS AGC for low voltage mixed signal applications

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3 Author(s)
Elwan, H.O. ; Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA ; Tarim, T.B. ; Ismail, M.

A new digitally controlled current mode automatic gain control (AGC) circuit is presented. The proposed circuit uses a novel digital control technique to provide a dB-linear gain control. The circuit is based on binary weighted current mirrors leading to a simple structure that is suitable for low voltage low power applications. When used in wireless communication applications, the AGC can effectively combine with the down-conversion mixer. The control range of a single stage AGC is -25 dB. Simulation results are included

Published in:

Circuits and Systems, 1998. Proceedings. 1998 Midwest Symposium on

Date of Conference:

9-12 Aug 1998