Demodulator employing cyclic switching of the gain factor of an

Details Demodulator employing cyclic switching of the gain factor of an Demodulator employing cyclic switching of the gain factor of an

1995-10-24

1996-08-27

Mis, David

Demodulators

Amplitude modulation demodulator

Input signal combined with local oscillator or carrier...

329362, 455337, H03D 100, H03D 104, H03D 118

Patent

active

055505074

ABSTRACT:
An AM demodulator circuit arrangement includes an operational amplifier having at least two alternate input networks and at least two alternate feedback networks which can be selectively activated by switching signals so as to establish an amplifier gain factor having at least two different predetermined values. The switching signals are derived from a square wave clock control signal of a frequency which is an integral multiple of the carrier frequency of the AM input signal supplied to the demodulator. As a result of the periodic variation of the amplifier gain factor, the demodulated signal is produced at the output of the amplifier. Such a demodulator avoids offsets or interference frequencies due to manufacturing tolerances. Sensitivity to interference at higher harmonics of the carrier frequency can be suppressed by appropriate selection of the waveform of the gain factor variation, which is determined by the waveform of the switching signal.

REFERENCES:
patent: 3631355 (1971-12-01), Vail
patent: 3879670 (1975-04-01), Fox
patent: 3891937 (1975-06-01), Bockelmann et al.
patent: 4031479 (1977-06-01), Thomas, Jr. et al.
patent: 4139738 (1979-02-01), Ienaka et al.
patent: 5015963 (1991-05-01), Sutton

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