Phase locked loop clock changeover apparatus in which the VCO is

Details Phase locked loop clock changeover apparatus in which the VCO is Phase locked loop clock changeover apparatus in which the VCO is

1992-07-24

1993-12-07

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 16, 331 25, H03L 718

Patent

active

052686540

ABSTRACT:
A clock changeover apparatus including a reference frequency divider for dividing a reference clock by a first frequency division number; a comparative frequency divider for dividing by a second frequency division number an output clock obtained by the clock changeover apparatus; a phase comparator for comparing phase of a signal of the reference frequency divider with that of the comparative frequency divider; a clock controller for changing the output clock so as to make the phase of the signal of the reference frequency divider coincident with that of the comparative frequency divider; a clock determining member which gives an initial value of the output clock to the clock controller and is capable of selecting the initial value of the output clock arbitrarily; a changeover member for effecting changeover between the first and second frequency division numbers; and a phase lock detector for monitoring whether or not the phase of the signal of the reference frequency divider coincides with that of the comparative frequency divider.

REFERENCES:
patent: 4105948 (1978-08-01), Wolkstein
patent: 4437072 (1984-03-01), Asami
patent: 4951005 (1990-08-01), Babin
patent: 4987387 (1991-01-01), Kennedy et al.
patent: 5036216 (1991-07-01), Hohmann et al.

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