Title :
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
fDate :
7/1/1998 12:00:00 AM
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;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
