Title :
Low voltage digitally controlled dB-linear CMOS VGA circuit for wireless communication
Author :
Elwan, Hassan O. ; Ismail, Mohammed
Author_Institution :
Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA
Abstract :
A new digitally controlled dB-linear variable gain amplifier (VGA) circuit is presented. The circuit is developed taking into account system level issues for a direct conversion receiver. The circuit uses a novel technique to digitally implement a dB-linear gain characteristic of 25 dB. The proposed VGA can process voltage or current input signals and operates in a fully differential configuration. APLAC simulations and experimental results from a 2 μm chip fabricated through MOSIS are provided
Keywords :
CMOS analogue integrated circuits; differential amplifiers; digital control; gain control; radio receivers; radiofrequency amplifiers; 2 micron; LV CMOS VGA circuit; current input signals; dB-linear gain characteristic; digitally controlled VGA circuit; direct conversion receiver; fully differential configuration; low voltage VGA circuit; variable gain amplifier; voltage input signals; wireless communication; Bandwidth; Baseband; CMOS digital integrated circuits; Communication system control; Digital control; Equations; Gain control; Low voltage; Voltage control; Wireless communication;
Conference_Titel :
Electronics, Circuits and Systems, 1998 IEEE International Conference on
Conference_Location :
Lisboa
Print_ISBN :
0-7803-5008-1
DOI :
10.1109/ICECS.1998.813336
