Sample and hold demodulator with feedback for reduced riffle

Details Sample and hold demodulator with feedback for reduced riffle Sample and hold demodulator with feedback for reduced riffle

1985-06-04

1986-10-14

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

H03D 318

Patent

active

046175210

ABSTRACT:
A demodulator circuit comprises an integrator (A1) having its input connected through a first switch (S1) to a summing point (P). A modulated carrier signal to be demodulated is applied to the summing point through an input resistor (R1). A sample-and-hold circuit comprises a second switch (S2) operable at the carrier signal frequency in antiphase with the first switch (S1) to connect the output of the integrator (A1) to a holding capacitor (C2) and an operational amplifier (A2) having 100% negative feedback. A feedback connection including a feedback resistor (R2) is connected between the output of the amplifier (A2) and the summing point (P).

REFERENCES:
patent: 4393352 (1983-07-01), Volpe et al.
patent: 4426623 (1984-01-01), Wilkens et al.

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