Title :
Improved design techniques for the realization of linear power amplifiers for wireless transmitters
Author :
Thornton, William T. ; Larson, Lawrence E.
Author_Institution :
Dept. of Electr. Eng., California Univ., San Diego, La Jolla, CA, USA
Abstract :
Improved power amplifier linearization techniques are required for next-generation wireless communications systems. An improved microwave feedforward amplifier (FFA) architecture has been developed, and applied to the 5.725 to 5.850 GHz ISM band (ISM-5700). This FFA is composed of a driver amplifier and a main amplifier, and the phase shift and attenuation functions are performed utilizing vector modulators. This FFA offers a 30 dB improvement in the third order carrier-to-intermodulation (C/I3) ratio performance at the rated output power level of 30 dBm and is the first demonstration of a 5 GHz FFA utilizing vector modulation
Keywords :
feedforward; linearisation techniques; microwave power amplifiers; modulation; radio transmitters; 5.725 to 5.85 GHz; ISM band; ISM-5700; attenuation function; design techniques; driver amplifier; linear power amplifiers; main amplifier; microwave feedforward amplifier architecture; phase shift function; power amplifier linearization techniques; vector modulators; wireless transmitters; Bandwidth; Frequency; High power amplifiers; Nonlinear distortion; Power amplifiers; Power generation; Radio transmitters; Radiofrequency amplifiers; Telephone sets; Wireless communication;
Conference_Titel :
Mixed-Signal Design, 1999. SSMSD '99. 1999 Southwest Symposium on
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-5510-5
DOI :
10.1109/SSMSD.1999.768609
