Digitally controlled variable frequency synthesizer

Details Digitally controlled variable frequency synthesizer Digitally controlled variable frequency synthesizer

1986-12-12

1987-09-29

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 331 25, H03L 718

Patent

active

046971564

ABSTRACT:
In a generator whose frequency can be set digitally and connected in a phase-locked loop (PLL) with a frequency divider whose frequency divider ratio is periodically changed, the sum of the phase errors, which are the phase deviations of the individual frequency-divider delivered pulses from the phase of the reference frequency, is calculated and each pulse for which the phase-error sum exceeds a predetermined value is delayed by a time period corresponding to this value before being fed to the phase meter or phase detector of the phase-locked loop. As a result, any drift or oscillatory fluctuations of the voltage-controlled oscillator (VCO) control voltage are confined to substantially high frequencies and only very weak subharmonic components, and the oscillatory fluctuations can be filtered out easily by a low-pass filter between the phase detector or phase meter and the control-voltage input of the VCO. Also the generation of a compensating voltage is possible using digital means at low cost and with the result that high stability and accuracy of the selected output frequency can be ensured.

REFERENCES:
patent: 4573023 (1986-02-01), Cok et al.

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