Phase-locked loop having elongated time for charge and discharge

Details Phase-locked loop having elongated time for charge and discharge Phase-locked loop having elongated time for charge and discharge

1988-08-17

1989-08-15

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 8, 331 25, H03L 706, H03L 708, H03L 718

Patent

active

048578665

ABSTRACT:
A phase-locked loop circuit comprises a controlled oscillator receiving a control signal for generating an oscillation signal of a frequency corresponding to the received control signal, and a frequency divider receiving the oscillation signal for generating a signal having a frequency divided by a given frequency division ratio. A phase detector receives an input signal and the frequency-divided signal. This phase detector generates a first phase difference signal starting at the input signal and terminating at one of a rising edge of the frequency-divided signal. The phase detector also generates a second phase difference signal having a constant pulse width in an interval period between each pair of adjacent first phase difference signals without substantially overlapping the first phase difference signal. A charge pump responds to the first phase difference signal to generate a first control signal for changing the oscillation frequency of the controlled oscillator in a first direction, and also responds to the second phase difference signal to generate a second control signal for changing the oscillation frequency of the controlled oscillator in a second direction opposite to the first direction.

REFERENCES:
patent: 4750193 (1988-06-01), Bailey

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