Title :
A 60-dB 246-MHz CMOS variable gain amplifier for subsampling GSM receivers
Author :
Mostafa, Mohamed A I ; Embabi, Sherif H K ; Elmala, Mostafa
Author_Institution :
Micro Linear Corp., San Jose, CA, USA
Abstract :
A variable gain amplifier (VGA) is designed for a GSM subsampling receiver. The VGA is implemented in a 0.35-/spl mu/m CMOS process and approximately occupies 0.64 mm/sup 2/. It operates at an IF frequency of 246 MHz. The VGA provides a 60-dB digitally controlled gain range in 2-dB steps. The overall gain accuracy is less than 0.3 dB. The current is 9 mA at 3 V supply. The noise figure at maximum gain is 8.7 dB. The IIP3 is -4 dBm at minimum gain, while the OIP3 is -1 dBm at maximum gain. The group delay is 1.5 ns across 5-MHz bandwidth.
Keywords :
CMOS analogue integrated circuits; cellular radio; feedback amplifiers; integrated circuit noise; low-power electronics; 0.35 micron; 246 MHz; 3 V; 5 MHz; 8.7 dB; 9 mA; CMOS; IF frequency; VGA; digitally controlled gain range; gain accuracy; group delay; noise figure; subsampling GSM receivers; variable gain amplifier; Band pass filters; Bandwidth; CMOS process; Circuits; Dynamic range; GSM; Gain; Linearity; Noise figure; Noise measurement;
Journal_Title :
Very Large Scale Integration (VLSI) Systems, IEEE Transactions on
DOI :
10.1109/TVLSI.2003.814326
