A low-voltage low-power wide-range CMOS variable gain amplifier

Author

Motamed, Ali ; Hwang, Changku ; Ismail, Mohammed

Author_Institution

Analog VLSI Lab., Ohio State Univ., Columbus, OH, USA

Volume

45

Issue

7

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

800

Lastpage

811

Abstract

In this paper, a compact low-power (LP) low-voltage (LV) metal-oxide-semiconductor-only (MOS-only) variable gain amplifier (VCA) is introduced. This amplifier based on complementary MOS (CMOS) transistors operating in strong inversion is composed of a pseudo-exponential current-to-voltage converter, analog multiplier, and output stage. The gain of the amplifier is controlled exponentially by a novel wide-range pseudo-exponential current-to-voltage converter implemented with two back-to-back connected current mirrors exhibiting superb exponential characteristic. Also, a new LV/LP composite transistor is introduced to increase the input dynamic range of the multiplier. The amplifier is fabricated using a 2-μm MOSIS n-well process, and its simulation and measurement results are shown in detail

Keywords

CMOS analogue integrated circuits; wideband amplifiers; 2 micron; MOSIS n-well process; analog multiplier; composite transistor; current mirror; dynamic range; low-voltage low-power wide-range CMOS variable gain amplifier; metal-oxide-semiconductor transistor; output stage; pseudo-exponential current-to-voltage converter; Analog circuits; Analog integrated circuits; Digital circuits; Dynamic range; Energy consumption; Gain; Laboratories; Transconductance; Very large scale integration; Voltage;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.700927

Filename

700927