Demodulator for pulse width modulated signals

Details Demodulator for pulse width modulated signals Demodulator for pulse width modulated signals

1979-05-09

1985-06-04

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329106, 307246, 375 94, H03D 118

Patent

active

045217360

ABSTRACT:
A simple demodulator circuit for demodulating high frequency pulse width modulated carrier signals, includes means for charging a capacitor to charge levels commensurate with the pulse widths. Output switch means, biased at the verge of conduction, discharge the capacitor charge at the ends of the pulses as an exponential signal with given time constant. Since the amplitudes of successive exponential signals are proportional to the respective capacitor charge levels, the charge levels are simultaneously read during the discharge process, thereby allowing demodulation at very high speeds.

REFERENCES:
patent: 2421025 (1947-05-01), Grieg
patent: 3473050 (1969-10-01), Groom
Ferrie, Ronald, "Designers Casebook", Electronics, 4/19/1965, pp. 90-91.

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