Pulse width modulator for amplitude modulation circuit

Details Pulse width modulator for amplitude modulation circuit Pulse width modulator for amplitude modulation circuit

1979-05-25

1981-06-09

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 9R, 332 31R, 332 64, 332 67, 375 22, 375 41, H03C 100, H03K 708

Patent

active

042727375

ABSTRACT:
A pulse width modulation circuit which uses a tube, such as a tetrode tube as the switching element, is arranged to minimise excessive power dissipation in the screen electrode circuit of the tube. The screen electrode is driven from a constant current source to prevent excessive current being diverted from the cathode to the screen electrode which would otherwise occur when the impedance of the anode circuit rises to a high value.

REFERENCES:
patent: 4118677 (1978-10-01), Weldon
Anon, "PDM Spart Strom", Radio Mentor Electronic, vol. 42, _No. 12, p. 482, Dec. 1976.

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