Title :
Phase-correcting feedback system for class E power amplifier
Author :
Sowlati, Tirdad ; Greshishchev, Yuriy M. ; Salama, C. André T
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
fDate :
4/1/1997 12:00:00 AM
Abstract :
A phase-correcting feedback system which reduces the AM-to-PM distortion of Class E power amplifiers for wireless communication is presented in this paper. It comprises a novel limiting amplifier, a phase detector, and a phase shifter all operating at 835 MHz. The phase-correcting feedback together with a Class E power amplifier were fabricated in a 0.8-μm GaAs MESFET process. The limiting amplifier has a phase error less than 2.5°. The phase detector and phase shifter have a sensitivity of 10 mV/degree and 80°/V, respectively. The Class E power amplifier delivers 26.5 dBm to the load with a power added efficiency of 67%. The phase correcting feedback system reduces the 30° phase distortion of the Class E amplifier down to 4°, and its total power dissipation is 21.5 mW
Keywords :
III-V semiconductors; MESFET integrated circuits; UHF integrated circuits; UHF phase shifters; UHF power amplifiers; electric distortion; feedback amplifiers; gallium arsenide; power amplifiers; 0.8 micron; 21.5 mW; 67 percent; 835 MHz; AM-to-PM distortion; GaAs; III-V semiconductors; MESFET process; class E power amplifier; limiting amplifier; phase detector; phase error; phase shifter; phase-correcting feedback; phase-correcting feedback system; power added efficiency; total power dissipation; wireless communication; Detectors; Feedback; Gallium arsenide; MESFETs; Phase detection; Phase distortion; Phase shifters; Power amplifiers; Power dissipation; Wireless communication;
Journal_Title :
Solid-State Circuits, IEEE Journal of
