Frequency synthesizer having a speed-up circuit

Details Frequency synthesizer having a speed-up circuit Frequency synthesizer having a speed-up circuit

1998-02-24

1999-10-05

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 1A, 331 16, 331 25, 327105, 327156, 455260, H03L 710, H03L 718

Patent

active

059631007

ABSTRACT:
It is an object of the present invention to provide a frequency synthesiser with a lock speed-up arrangement in a simple and effective form. In accordance with the invention there is provided a frequency synthesiser including a voltage controlled oscillator, a phase detector which receives a base frequency signal and a feedback signal derived from the output of the voltage controlled oscillator and a filter circuit connecting the output of phase detector to a frequency control voltage input of the voltage controlled oscillator, the filter circuit having a reference voltage connection, and a speed-up circuit for applying a voltage signal to the reference voltage connection when a frequency change is demanded.

REFERENCES:
patent: 4980652 (1990-12-01), Tarusawa et al.
patent: 5355098 (1994-10-01), Iwasaki
patent: 5389899 (1995-02-01), Yahagi et al.

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