Frequency synthesizer with low power consumption

Details Frequency synthesizer with low power consumption Frequency synthesizer with low power consumption

1987-02-26

1988-06-28

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 17, 331 25, H03L 706

Patent

active

047542357

ABSTRACT:
A synthesizer apparatus includes a reference oscillator for generating a reference signal, a voltage controlled oscillator (VCO) whose oscillation frequency is controlled by a control signal, a frequency divider, which is intermittently operated, for frequency-dividing the output signal from the VCO, and a phase comparator for comparing the phases of the reference signal and the output signal from the frequency divider, and supplying a control signal to the VCO in accordance with the phase difference. The phase comparator outputs an average value signal having an average value corresponding to a difference in pulse rise times of the output signal from the frequency divider during an operation period of the frequency divider.

REFERENCES:
patent: 4625180 (1986-11-01), Itaya et al.
patent: 4673892 (1987-06-01), Miyashita et al.

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