Power amplifier having multiple switched stages and method of op

Details Power amplifier having multiple switched stages and method of op Power amplifier having multiple switched stages and method of op

1990-06-05

1992-03-24

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330207A, 330251, H03F 338

Patent

active

050992031

ABSTRACT:
A power amplifier for a plate load of an AM, RF transmitter includes plural switching stages each powered by a DC source. Each stage is switched from non-sourced to saturation in response to the amplitude of an analog source exceeding a threshold amplitude for the stage; each stage has a different threshold. The thresholds and analog source are arranged so that responses derived between output terminals of the stages change between zero and predetermined amplitudes as the source amplitude changes relative to the thresholds of the different stages. The responses of the different stages are summed. A triangular wave having a small constant maximum amplitude relative to the analog source maximum value effectively changes the threshold of each stage. From time to time the thresholds of different stages are changed so that at different times different stages are in non-sourced and conducting for the same amplitude of the modulating source, while providing the same summed response for the same amplitude of the modulating source.

REFERENCES:
patent: 3506920 (1970-04-01), Swanson
patent: 3588744 (1971-06-01), Swanson
patent: 4140980 (1979-02-01), Cummings
patent: 4164714 (1979-08-01), Swanson
patent: 4369409 (1983-01-01), Kyrian et al.
patent: 4403197 (1983-09-01), Swanson
patent: 4468626 (1984-08-01), Swanson
patent: 4560944 (1985-12-01), Furrer
patent: 4724420 (1988-02-01), Woodard
patent: 4747161 (1988-05-01), Hulsey et al.
patent: 4776036 (1988-10-01), Hulsey et al.
patent: 4896372 (1990-01-01), Weaver

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