Phase-locked loop having improved input jitter characteristics

Details Phase-locked loop having improved input jitter characteristics Phase-locked loop having improved input jitter characteristics

1989-08-28

1990-07-17

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 17, H03L 7093

Patent

active

049423711

ABSTRACT:
In a phase-locked loop, a phase comparator, a low-pass filter, and a voltage-controlled oscillator are connected in a loop form. The phase-locked loop includes a switching circuit, arranged between the low-pass filter and the voltage-controlled oscillator, for switching an output signal from the phase comparator or an output signal from the low-pass filter to input the selected output signal to the voltage-controlled oscillator, and an input/output signal monitor circuit for controlling a switching timing of the switching circuit in response to a synchronization state between an input signal to the phase comparator and an output signal from the voltage-controlled oscillator, and in accordance with frequency components of the input signal.

REFERENCES:
patent: 4007429 (1977-02-01), Cadalora et al.
Phaselock Techniques by F. M. Gardner P9-P13, John Wiley & Sons, 1979.

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