Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1982-04-05
1984-06-26
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 10, 331 17, 331 23, 331 27, 375120, H03L 708
Patent
active
044568908
ABSTRACT:
A clock recovery system including a VCO responsive to a voltage signal for generating a clock signal. A phase detector includes a register and a PROM, the register counting the clock signal to derive the output clock signal. The PROM is responsive to input data and the count in the register to detect and store information concerning relative phase relationships. A counter contains a count from which the control voltage for the VCO is derived. The PROM is operable to alter the count in the counter, thereby performing frequency adjustments, and to alter the count in the register to perform phase adjustments. Also, a converter, operable by the phase detector, may also derive a voltage signal for damping purposes.
REFERENCES:
patent: 4017803 (1977-04-01), Baker
patent: 4027274 (1977-05-01), Fukui et al.
patent: 4166979 (1979-09-01), Waggener
patent: 4215430 (1980-07-01), Johnson
patent: 4259740 (1981-03-01), Snell et al.
patent: 4280099 (1981-07-01), Rattlingourd
Gupta, "Phase-Locked Loops", Proceedings of the IEEE, vol. 63, No. 2, Feb. 1975, pp. 291-306.
Angus Robert M.
Computer Peripherals Inc.
Genovese Joseph A.
Grimm Siegfried H.
Mis David C.
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