Title :
A 47-dB linear CMOS variable gain amplifier using current squaring technique
Author :
Cheng, Xin ; Yang, Haigang ; Gao, Tongqiang ; Liu, Fei
Author_Institution :
Instn. of Electron., Chinese Acad. of Sci., Beijing, China
Abstract :
In this paper, a CMOS linear-in-dB variable gain amplifier (VGA) is presented. The VGA consists of exponential control block which includes a current squaring circuit, amplifier block and common mode feedback block. Based on the current squaring block which doubles the gain range, a 47dB (-20dB to 27dB) continuous gain range is achieved with a single-stage structure. Simulation results show that the VGA core consumes 3mA of current from a 1.2V supply and has a 3-dB bandwidth greater than 200MHz. The IIP3 and the input referred noise density are within the ranges of 3 to -17dBm and 5 to 68 nV/sqrt(Hz) respectively.
Keywords :
CMOS integrated circuits; amplifiers; amplifier block; common mode feedback block; continuous gain range; current 3 mA; current squaring technique; exponential control block; gain 47 dB; input referred noise density; linear CMOS variable gain amplifier; voltage 1.2 V; Bandwidth; CMOS integrated circuits; CMOS technology; Gain; Gain control; Noise; Voltage control; CMOS; VGA; current squaring; decibel linear;
Conference_Titel :
Circuits and Systems (APCCAS), 2010 IEEE Asia Pacific Conference on
Conference_Location :
Kuala Lumpur
Print_ISBN :
978-1-4244-7454-7
DOI :
10.1109/APCCAS.2010.5774826
