Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

1993-01-11

1994-05-10

Chin, Stephen

Pulse or digital communications

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375119, 331 25, H03D 324

Patent

active

053115600

ABSTRACT:
A frequency synthesizer which can effect a high speed frequency hopping operation without causing deterioration in stability in phase and frequency in a phase frequency-locked condition and also in output spurious characteristic is disclosed. An output range controlling circuit clips the output voltage of a phase frequency to voltage converting circuit at a voltage corresponding to an input signal. The phase frequency to voltage converting circuit outputs a voltage corresponding to a pulse width inputted thereto from a phase frequency detector. A low-pass filter removes high frequency components of a signal inputted thereto. A voltage-controlled oscillator outputs a signal having a frequency corresponding to a voltage of a signal having passed through the low-pass filter. The phase frequency detector effects phase frequency detection between a reference signal and a signal obtained by frequency dividing the output of the voltage-controlled oscillator by an arbitrary value by a variable frequency divider.

REFERENCES:
patent: 4500857 (1985-02-01), Bosselaers et al.
patent: 4520319 (1985-05-01), Baker
patent: 4809068 (1989-02-01), Nagai
patent: 4980899 (1990-12-01), Troost et al.
patent: 5028885 (1991-07-01), Voigt et al.

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