Variable frequency signal generator

Details Variable frequency signal generator Variable frequency signal generator

1990-10-12

1992-01-07

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 1A, 331 10, 331 11, 331 17, H03L 718, H03L 7093

Patent

active

050795228

ABSTRACT:
A variable frequency signal generator includes a phase locked loop having a variable frequency oscillator which has a control port to which a frequency determining signal is applied, the output of the oscillator being fed via a frequency divider to a phase sensitive detector where it is compared with a reference frequency signal, the result of said comparison being arranged to generate a comparison signal which is fed to a loop filter which is coupled to said control port; and the signal generator having a frequency control signal applied thereto and comprising a first path being arranged to adjust the division ratio of the frequency divider, and a second path including a combiner for combining said frequency control signal and said comparison signal to produce said frequency determining signal; and a calibrator for adjusting the relative characteristics of said first and second paths to compensate for effects arising from tuning sensitivity dependence on frequency of said variable frequency generator.

REFERENCES:
patent: 4453136 (1984-06-01), Kelland
patent: 4568888 (1986-02-01), Kimura et al.
patent: 4677394 (1987-06-01), Vollmer
patent: 4743867 (1988-05-01), Smith
patent: 4980652 (1990-12-01), Tarusawa et al.

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