Frequency control with a phase-locked-loop

Details Frequency control with a phase-locked-loop Frequency control with a phase-locked-loop

1981-09-04

1984-11-20

Miller, Stanley D.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 25, 331 18, 329 50, 329122, 328155, 455 75, 455605, 455606, 343 5AF, 343 7PL, 343 76, 307262, 367 95, H03L 706, G01S 1382

Patent

active

044841540

ABSTRACT:
A frequency control system with a phase-locked loop for automatically adjusting the frequency of an alternating signal and an external signal derived coherently therefrom to the variant zero phase-shift frequency of a phase shifter adapted to receive the external signal, the control system comprising: a phase shifter responsive to the external signal for introducing a frequency sensitive bipolar phase-shift to the external signal to produce a phase shifted external signal thereat, the phase shifter introducing zero phase-shift at a drift-prone frequency, f.sub.o ; an alternating signal source for generating the alternating signal of adjustable frequency covering a range of frequencies including frequency, f.sub.o, and variations thereof; a phase detector responsive to both the alternating signal and phase-shifted external signal for producing a phase-difference signal corresponding to the difference in phase between the alternating signal and phase-shifted external signal; and a signal integrator responsive to the phase-difference signal for converting the phase-difference signal to a frequency control signal; the alternating signal source being responsive to the frequency control signal in a phase-difference minimizing relation whereby the alternating signal frequency is adjusted to be substantially equal to frequency, f.sub.o.

REFERENCES:
patent: 3597754 (1971-08-01), Lerner
patent: 3649123 (1972-03-01), Ulicki
patent: 4019138 (1977-04-01), Watanabe et al.
patent: 4032858 (1977-06-01), Hargis
patent: 4107684 (1978-08-01), Watson, Jr.
patent: 4122427 (1978-10-01), Karsh
patent: 4155087 (1979-05-01), Okrent
patent: 4225950 (1980-09-01), Kotera et al.
patent: 4271371 (1981-06-01), Furuichi et al.
patent: 4327362 (1982-04-01), Hoss
Best, R., "Theory and Applications of Phase Locked Loops," part 6, Der Elektroniker, v. 15 n. 7 pp. EL26-EL32, Jul. 1976.

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