Digitally programmable dB-linear CMOS AGC for mixed-signal applications

Author

Elwan, Hassan O. ; Tarim, Tuna B. ; Ismail, Mohammed

Author_Institution

Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA

Volume

14

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

8

Lastpage

11

Abstract

Central to the design of a high-performance, high-dynamic mixed-signal interface circuitry is the design of a linear (in the db scale) automatic gain control (AGC) loop. Achieving this db-linear characteristic requires an exponential function and is therefore, not straightforward to implement with CMOS devices in strong inversion. The article in this column discusses a simple CMOS circuit design solution to this problem, The design is also digitally controlled, which should help in designing simple mixed-signal interfaces with low power consumption and less chip area

Keywords

CMOS integrated circuits; automatic gain control; integrated circuit design; mixed analogue-digital integrated circuits; AGC; CMOS; chip area; digitally controlled design; digitally programmable dB-linear circuit; exponential function; mixed-signal applications; power consumption; CMOS image sensors; Circuits; Digital control; Digital signal processing chips; Dynamic range; Feedback loop; Filters; Gain control; Signal processing; System-on-a-chip;

fLanguage

English

Journal_Title

Circuits and Devices Magazine, IEEE

Publisher

ieee

ISSN

8755-3996

Type

jour

DOI

10.1109/101.708487

Filename

708487