Voltage controlled oscillator for a transmission line communicat

Details Voltage controlled oscillator for a transmission line communicat Voltage controlled oscillator for a transmission line communicat

1978-12-04

1981-02-24

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

331177R, 455260, H04J 102, H03B 304

Patent

active

042531802

ABSTRACT:
A voltage controlled oscillator which may be used in the receiver of a communications system, such as a carrier telephone system, for aiding in the demodulation of received carrier signals. The oscillator includes circuitry for generating first and second reference signals at a frequency equal to the carrier signal. Also included in the oscillator is circuitry which in response to the magnitude of an error signal variably connects a frequency determining electrical parameter to the frequency generating circuitry to thereby vary the frequency of the reference signals. The error signal magnitude represents the difference in phase between the carrier signal and the first reference signal.

REFERENCES:
patent: 2960573 (1960-11-01), Hodgson et al.
patent: 3582823 (1971-06-01), Pasos
patent: 3603890 (1971-09-01), Camenzind
patent: 4000476 (1976-12-01), Walker et al.
patent: 4001511 (1977-01-01), Buchholtzer et al.
"On An Inductorless FM Stereo Multiplex Circuit using a Phase-Locked Loop," IEEE Trans. Broadcast & Television Receivers, USA, vol. BTR-16, No. 4 (Nov. 1970), by Padgett et al., pp. 281-289, 329-122.
"A Primer on Phase-Locked Loops," by Lew, Electronic Design, Jul. 20, 1964, pp. 56-60, vol. 12, No. 15.

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