Title :
A CMOS dB-linear RF VGA for SAW-less WEDGE transmitters
Author :
Akyol, Hasan ; Agarwal, Bipul ; Firouzkouhi, Hamid A. ; Badillo, Dean A.
Abstract :
A CMOS dB-linear RF variable gain amplifier (VGA) that can provide a variable gain of 25-dB is implemented. The 25-dB of this range is achieved by a dB-linear V-I converter, which includes current limiting circuitry to reduce the gain variation due to process and temperature at maximum and minimum output power levels. The circuits are designed in a 0.13-um RF CMOS process. The measurement results demonstrate -45 dBc ACLR, -165-dBc/Hz Rx-band noise at 5-dBm output power and 25-dB dynamic gain control range in UMTS band for WCDMA. The RF VGA consumes 30-mA of current at maximum gain from a 1.8-V supply.
Keywords :
3G mobile communication; CMOS integrated circuits; amplifiers; code division multiple access; current limiters; integrated circuit design; radio transmitters; radiofrequency integrated circuits; wavelength division multiplexing; CMOS dB-linear RF VGA; RF CMOS process; SAW-less WEDGE transmitter; UMTS band; WCDMA; circuit design; current 30 mA; current limiting circuitry; dB-linear V-I converter; gain 25 dB; size 0.13 mum; variable gain amplifier; voltage 1.8 V; CMOS process; Circuits; Current limiters; Gain; Power amplifiers; Power generation; Radio frequency; Radiofrequency amplifiers; Temperature distribution; Transmitters; RF driver amplifier; VGA; dB-linear; exponential current generator; voltage to current converter;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2010 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
978-1-4244-4725-1
Electronic_ISBN :
978-1-4244-4726-8
DOI :
10.1109/RWS.2010.5434273
