Phase synchronous circuit

Details Phase synchronous circuit Phase synchronous circuit

1997-04-01

1999-08-17

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 1A, 331 14, 331 25, 375375, 327159, 327160, H03L 700, H03L 7087

Patent

active

059399473

ABSTRACT:
A phase synchronous circuit, in the process of locking an internal signal to an input signal by a PLL loop, makes a frequency of the internal signal stepwise approximate to a frequency of the input signal under digital PLL control at a first stage, and adjusting a phase under analog PLL control at a next stage, thus controlling a variable frequency oscillator at the two stages. A gain with which an analog PLL control system is burdened can be thereby reduced, and a gain of VCO may not be set larger than required even if a frequency of an output signal f.sub.out is high.

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