Title :
Microwave power amplifiers with digitally-controlled power supply voltage for high efficiency and high linearity
Author :
Ranjan, Manish ; Koo, K.H. ; Hanington, G. ; Fallesen, C. ; Asbeck, P.
Author_Institution :
California Univ., San Diego, La Jolla, CA, USA
Abstract :
A power amplifier architecture is presented which comprises a basic amplifier with an efficient, high modulation bandwidth DC-DC converter. The amplifier and the DC-DC converter are controlled by a digital signal processor that provides input signal pre-distortion, supply voltage optimization and equalization. Experimental results at 950 MHz showed ACPR values acceptable for IS-95 CDMA handset applications. With variable power supply, the overall efficiency improved by a factor of 1.4/spl times/ (when averaged over representative conditions of usage).
Keywords :
DC-DC power convertors; cellular radio; circuit optimisation; code division multiple access; hybrid integrated circuits; microwave integrated circuits; microwave power amplifiers; telephone sets; 950 MHz; DC-DC converter; IS-95 CDMA handset applications; digital signal processor; digitally-controlled power supply voltage; efficiency; input signal pre-distortion; linearity; microwave power amplifiers; modulation bandwidth; supply voltage optimization; variable power supply; Bandwidth; DC-DC power converters; Digital control; Digital signal processors; High power amplifiers; Microwave amplifiers; Power amplifiers; Power supplies; Signal processing; Voltage control;
Conference_Titel :
Microwave Symposium Digest. 2000 IEEE MTT-S International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-5687-X
DOI :
10.1109/MWSYM.2000.861088
