Frequency synthesizer and frequency synthesizing method

Details Frequency synthesizer and frequency synthesizing method Frequency synthesizer and frequency synthesizing method

1993-03-01

1995-04-11

Chin, Stephen

Pulse or digital communications

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375119, 331 1A, H03D 324

Patent

active

054065917

ABSTRACT:
A frequency synthesizer and a frequency synthesizing method are disclosed. They are used to achieve frequency switching in a short time even though the switched width of an output frequency signal from the frequency synthesizer is narrow. A gate pulse generator circuit generates a gate pulse signal using a frequency division number data activation signal upon setting the output frequency from the frequency synthesizer. A gate circuit interrupts a reference frequency signal over a predetermined time interval with the aid of the gate pulse signal and thereafter drives a voltage-controlled oscillator to oscillate at a new frequency with the aid of a phase comparator, a charge pump circuit, and a low-pass filter.

REFERENCES:
patent: 4849704 (1989-07-01), Thornton
patent: 4980899 (1990-12-01), Troost et al.
patent: 5028885 (1991-07-01), Voigt et al.
patent: 5052031 (1991-09-01), Molloy
patent: 5197086 (1993-03-01), Jackson et al.

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