Linear phase demodulator including a phase locked loop with auxi

Details Linear phase demodulator including a phase locked loop with auxi Linear phase demodulator including a phase locked loop with auxi

1975-11-26

1976-12-14

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 331 23, 331 36C, 332 30V, H03C 322, H03D 320

Patent

active

039978486

ABSTRACT:
A phase modulated wave that may have no carrier power is demodulated by a phase locked loop including a phase detector for deriving an A.C. data output signal having a magnitude and a phase indicative of the phase of the modulated wave. A feedback loop responsive to the data output signal restores power to the carrier frequency component to the loop. In one embodiment, the feedback loop includes a phase modulator responsive to the phase modulated wave and the data output signal. In a second embodiment, carrier frequency power is restored by differentiating the data output signal and supplying the differentiated signal to an input of a voltage controlled oscillator included in the phase locked loop. Preferably, the phase modulator is linear and includes a series inductance-capacitance network, wherein the capacitor is a voltage controlled varactor. To compensate for nonlinearities in the varactor reactance vs. voltage characteristic, the series circuit is shunted by a properly selected inductance.

REFERENCES:
patent: 3479615 (1969-11-01), Garver
patent: 3600700 (1971-08-01), Matsuo
patent: 3657661 (1972-04-01), Jarger
patent: 3745255 (1973-07-01), Fletcher et al.

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