Phase locked loop signal demodulator and squelch circuit

Details Phase locked loop signal demodulator and squelch circuit Phase locked loop signal demodulator and squelch circuit

1977-10-13

1978-09-26

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325346, 325348, 325349, 329122, 329136, 331 8, 331 23, 331 27, 331 34, 331108D, 331113R, H03D 318

Patent

active

041174100

ABSTRACT:
An FM demodulator and detector suitable for integration including a phase locked loop for locking to an FM signal and recovering the modulating signal and squelch circuitry coupled to the phase locked loop for gating out the recovered modulating signal. The phase locked loop includes an emitter coupled multivibrator whose phase shifted output is applied together with the FM signal to the squelch circuitry for quadrature phase detection, followed by filtering to derive an indication signal for controlling the gating of the recovered modulating signal.

REFERENCES:
patent: 3397360 (1968-08-01), Kaneko et al.
patent: 3457512 (1969-07-01), Deman
patent: 3564434 (1971-02-01), Camenzind et al.
patent: 3582809 (1971-06-01), Rigby
patent: 3659224 (1972-04-01), Ball
patent: 3896272 (1975-07-01), Takahashi et al.

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