Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1997-02-26
1998-11-03
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
327361, 331 25, 331 30, H03L 7185
Patent
active
058314814
ABSTRACT:
A phase lock loop circuit includes an oscillator, a digital mixer, a comparator, a loop amplifier, and a low-pass filter. The oscillator has an oscillation frequency controlled by a control voltage. The digital mixer is constituted by a digital element to output a difference frequency signal between an oscillation output from the oscillator and an input mixing signal. The comparator compares at least the phase of the difference frequency signal output from the digital mixer with that of a reference frequency signal, and outputs a difference signal. The loop amplifier and the low-pass filter generate the control voltage for the voltage controlled oscillator on the basis of the difference signal output from the comparator.
REFERENCES:
patent: 3840822 (1974-10-01), Hoffmann
patent: 4446446 (1984-05-01), Fowks
patent: 4965533 (1990-10-01), Gilmore
patent: 5349310 (1994-09-01), Rieder et al.
Thomas J. Endres et al., "Induced End-of-Life Errors in a Fast Settling PLL", 1993 IEEE International Frequency Control Symposium, Feb. 6, 1993, pp. 261-269.
Grimm Siegfried H.
NEC Corporation
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