Phase synchronization system which reduces power consumption and

Details Phase synchronization system which reduces power consumption and Phase synchronization system which reduces power consumption and

1997-03-25

1998-10-27

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

331 1A, 331 25, 331DIG2, 327159, H03L 710

Patent

active

058282530

ABSTRACT:
The invention provides a phase synchronization system which stops, when an input of a phase reference signal from the outside stops, oscillation of a voltage-controlled oscillator to achieve reduction in power consumption and can produce and output a system clock signal free from high frequency pulse noise from the voltage controlled oscillator. The system includes a phase comparator, a phase synchronization circuit including a low-pass filter and a voltage-controlled oscillation circuit, a clock detection circuit for detecting the clock signal from the outside, a phase coincidence discrimination circuit for discriminating a phase coincidence condition at the phase synchronization circuit, an AND gate, and a stop/start control circuit including a pair of flip-flop circuits. When the clock signal from the outside stops, oscillation of the voltage-controlled oscillation circuit is stopped with control information from the stop/start control circuit. When the input of the clock signal is resumed, a phase synchronization signal from the voltage-controlled oscillation circuit is outputted to the outside via the AND gate after phase coincidence is discriminated by the phase coincidence discrimination circuit.

REFERENCES:
patent: 5170135 (1992-12-01), Ito et al.
patent: 5294894 (1994-03-01), Gebara
patent: 5304954 (1994-04-01), Saito et al.
patent: 5347232 (1994-09-01), Nishimichi
patent: 5363419 (1994-11-01), Ho

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