Pulse width modulating circuit

Details Pulse width modulating circuit Pulse width modulating circuit

1974-12-05

1978-10-03

Kominski, John

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

328223, 331173, H03K 708

Patent

active

041186770

ABSTRACT:
A modulator includes an output tank circuit energized from a d.c. source through a switching tube and a coupling circuit. The grid of the switching tube is driven by signal-modulated variable width rectangular pulses. The resulting output pulses from the switching tube are used to shock excite the tank circuit and thus produce a carrier wave having an amplitude that varies in accordance with the rectangular pulse width. The trailing edges of the switching tube output pulses are rapidly reduced to zero level by means of an auxiliary circuit that provides spikes of cutoff voltage to the tube grid at the termination of each variable width rectangular pulse. The coupling circuit serves to maintain the anode of the switching tube at a substantially constant voltage level while the tube is conducting so as to provide highly efficient operation.

REFERENCES:
patent: 2416368 (1974-02-01), Young, Jr.
patent: 2493778 (1950-01-01), Rosen
patent: 2498711 (1950-02-01), Royden
patent: 2611091 (1952-09-01), Boykin
patent: 2735014 (1956-02-01), Rado
patent: 2741701 (1956-04-01), Harris
patent: 2919414 (1959-12-01), Neitzert
patent: 3200350 (1965-08-01), Sharp
patent: 3229227 (1966-01-01), Popodi
Electronics, pp. 63-64, Jan. 25, 1965.

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