Title :
A digitally controlled dB-linear CMOS AGC for low voltage mixed signal applications
Author :
Elwan, Hassan O. ; Tarim, Tuna B. ; Ismail, Mohammed
Author_Institution :
Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA
Abstract :
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
Keywords :
CMOS integrated circuits; automatic gain control; current mirrors; low-power electronics; mixed analogue-digital integrated circuits; mixers (circuits); binary weighted current mirrors; digitally controlled dB-linear CMOS AGC; down-conversion mixer; low power applications; low voltage mixed signal applications; single stage AGC; wireless communication applications; Circuits; Communication system control; Control systems; Digital control; Digital signal processing; Gain control; Low voltage; Mirrors; Voltage control; Wireless communication;
Conference_Titel :
Circuits and Systems, 1998. Proceedings. 1998 Midwest Symposium on
Conference_Location :
Notre Dame, IN
Print_ISBN :
0-8186-8914-5
DOI :
10.1109/MWSCAS.1998.759521
