Filter for converting pulse width modulation to amplitude modula

Details Filter for converting pulse width modulation to amplitude modula Filter for converting pulse width modulation to amplitude modula

1979-03-02

1981-02-10

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 9R, 332 37R, 332 64, 455108, H03C 106

Patent

active

042504694

ABSTRACT:
In a high efficiency amplitude modulation circuit. A pulse width modulation switch is arranged with a low pass filter to attentuate switching frequencies of the switch. A diode is connected in parallel with the input terminals of the low pass filter which diode provides a current discharge path for the filter while the switch is non-conductive. A further filter is also connected in parallel with the input terminals of the low pass filter, this further filter being arranged to provide cancellation of the input susceptance of the low pass filter over at least part of its pass band. The two filters in combination are such as to present a constant input conductance over at least part of the pass band of the low pass filter.

REFERENCES:
patent: 2968010 (1961-01-01), Case, Jr.
patent: 3384838 (1968-05-01), Knutrud
patent: 3435378 (1969-03-01), Birt
patent: 4118677 (1978-10-01), Weldon

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