Method and apparatus for a finely adjustable clock circuit

Details Method and apparatus for a finely adjustable clock circuit Method and apparatus for a finely adjustable clock circuit

1997-04-29

1998-12-29

Kinkead, Arnold

Oscillators

Ring oscillators

331 1A, 331 45, 331 46, 331 49, 331 74, 377 47, 327156, 327160, 375371, 375376, 345213, H03B 2700

Patent

active

058545760

ABSTRACT:
A method and apparatus for generating a finely adjustable clock is accomplished by a ring oscillator, a plurality of counting circuits, and a controller. The ring oscillator generates a plurality of oscillations, wherein each of the oscillations have an approximately equal period and are phase shifted by an approximately equal phase shift. Each of the plurality of oscillations is provided to one of the counting circuits which divides the frequency of the respective oscillation by a given count value to produce corresponding periodic representation. The controller selects one of the corresponding periodic representations based on control signal to be the output oscillation, or clock signal. When the clock signal needs to be finely adjusted, the controller, based on the control signal, selects another one of the corresponding periodic representations. To achieve a finer adjustment of the output oscillation, the controller, based on the control signal, may select more than one of the corresponding periodic representations. By selecting a different periodic representation, the clock signal is slipped by the phase difference between the oscillations. The slipping should be done in a regular way, (Eg. every CPR cycle) or jitter may be introduced.

REFERENCES:
patent: 5268656 (1993-12-01), Muscavage
patent: 5694066 (1997-12-01), Shyong

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