Title :
A New High Efficiency Power Amplifier for Modulated Waves
Author_Institution :
Bell Telephone Laboratories, Inc., Whippany, New Jersey
Abstract :
This paper introduces a new form of linear power amplifier for modulated radio-frequency waves. Plate circuit efficiencies of sixty to sixty-five per cent independent of modulation are obtained by means of the combined action of varying load distribution among the tubes and varying circuit impedance over the modulation cycle. The theory of operation is developed and detailed observations on the behavior of tubes in the new circuit are given in the paper. The use of stabilized feedback in connection with this circuit is discussed and significant measurements on a laboratory model of a fifty-kilowatt transmitter are shown.
Keywords :
Broadcasting; Circuits; High power amplifiers; Impedance; Laboratories; Operational amplifiers; Power amplifiers; Radio transmitters; Radiofrequency amplifiers; Voltage;
Journal_Title :
Radio Engineers, Proceedings of the Institute of
DOI :
10.1109/JRPROC.1936.228468
