DocumentCode :
796111
Title :
An alternative approach to improving the efficiency of high power radio frequency amplifiers
Author :
Lu, Xiusong
Author_Institution :
Guangxi Broadcasting & TV Sch., China
Volume :
38
Issue :
2
fYear :
1992
fDate :
6/1/1992 12:00:00 AM
Firstpage :
85
Lastpage :
89
Abstract :
The concept of using fourth-harmonic rather than third-harmonic resonant circuits in the tuned plate circuits of high-power radio-frequency amplifiers to improve operating efficiency is proposed. The advantages are circuit simplicity, greater stability, and simpler adjustment than with third-harmonic-enriched amplifiers because the grid excitation voltage can be sinusoidal. Improvements in plate efficiency, envelope distortion, and carrier shift characteristics are comparable to those achieved with third-harmonic designs: however, implementation is simpler and the amplifier more stable because the requirement to maintain a constant grid current under conditions of plate modulation becomes less critical
Keywords :
power amplifiers; radiofrequency amplifiers; carrier shift characteristics; constant grid current; envelope distortion; fourth harmonic resonant circuits; grid excitation voltage; high power radio frequency amplifiers; operating efficiency; plate efficiency; plate modulation; stability; tuned plate circuits; Cathodes; Frequency; High power amplifiers; Power amplifiers; Power system harmonics; RLC circuits; Radio transmitters; Radiofrequency amplifiers; Switches; Voltage;
fLanguage :
English
Journal_Title :
Broadcasting, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9316
Type :
jour
DOI :
10.1109/11.142658
Filename :
142658
Link To Document :
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