Frequency acquisition circuit for phase locked loop

Details Frequency acquisition circuit for phase locked loop Frequency acquisition circuit for phase locked loop

1982-06-30

1985-07-02

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

331 1A, 331DIG2, H03D 300

Patent

active

045271275

ABSTRACT:
A phase locked loop having a second controllable oscillator connected to mix with the input signal to alter the frequency thereof toward phase lock and a pair of comparators with predetermined upper and lower limits therein connected to the control signal of the phase locked loop and controlling the controllable oscillator whenever the control signal is outside of the predetermined limits.

REFERENCES:
patent: 3882412 (1975-05-01), Apple, Jr.
patent: 4072905 (1978-02-01), Keelty
patent: 4087628 (1978-05-01), Sanders et al.
patent: 4100503 (1978-07-01), Lindsey et al.
patent: 4107623 (1978-08-01), Graf et al.
patent: 4131862 (1978-12-01), Black et al.
patent: 4313219 (1982-01-01), Gabler et al.
patent: 4423390 (1983-12-01), Waters
Blanchard, A. "Phase-Locked Loops Application to Coherent Receiver Design" Wiley & Sons, 1976 pp. 280-289.
Watkinson, S. W. "A Dual Phase Lock Loop Receiver", Philips Telecommunication Review, vol. 36, No. 1, pp. 5-12, (Apr. 1978).

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