Quadrature receiver

Details Quadrature receiver Quadrature receiver

1979-11-28

1981-06-16

Olms, Douglas W.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455260, H04H 500

Patent

active

042739586

ABSTRACT:
A quadrature receiver circuit in which the output frequency of a local oscillator is controlled to follow the free-running frequency of a voltage-controlled oscillator so that accurate four-phase demodulation is maintained independent of oscillator drift. The output control voltage of a phase comparator in a phase-locked loop circuit in the demodulator is coupled through a low-pass filter and a DC amplifier to the frequency control input of a voltage controlled local oscillator.

REFERENCES:
patent: 3769589 (1973-10-01), Buntschuh et al.
patent: 4035833 (1977-07-01), Shepard
patent: 4215316 (1980-07-01), Yamaguchi et al.

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