High power class B modulation amplifier for a broadcast transmit

Details High power class B modulation amplifier for a broadcast transmit High power class B modulation amplifier for a broadcast transmit

1981-12-04

1984-05-15

Mullins, James B.

Amplifiers

Including a push-pull stage

Power or bias supply circuits and control thereof

330202, 330297, 332 59, 455108, 455127, H03F 326

Patent

active

044491034

ABSTRACT:
A method for amplifying electric signals, an amplifier circuit and application of this amplifier circuit as the modulator stage of a subsequent amplifier, employing a variable anode voltage for the purpose of improving the efficiency of amplifiers and particularly of high-power modulation amplifiers which are used, for example, in broadcast transmitters for the amplitude modulation of the radio-frequency output stage. From the modulation signal to be amplified, a control signal is derived in a control stage, this control signal being associated with the amplitude of the envelope of this modulation signal and being used for controlling the output voltage of a modulator/rectifier. The control signal is caused to follow the modulation signal within a presettable response time.

REFERENCES:
patent: 4054843 (1977-10-01), Hamada
patent: 4186346 (1980-01-01), Wysocki

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