Frequency synthesizer having compensation for nonlinearities

Details Frequency synthesizer having compensation for nonlinearities Frequency synthesizer having compensation for nonlinearities

1989-08-31

1990-12-25

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 10, 331 14, 331 16, 331 17, 331 25, H03L 7189

Patent

active

049806521

ABSTRACT:
In a phase locked loop frequency synthesizer, the frequency of a VCO is switched by changing the division ratio of a variable ratio frequency divider in the feedback path of the loop. At the time of switching, a prepositioning voltage is applied to the VCO to realize fast frequency switching. To correct for nonlinear response of the VCO, the prepositioning voltage is adjusted according to information received from a voltage measuring circuit connected to the VCO control circuit.

REFERENCES:
patent: 4410860 (1983-10-01), Kipp et al.
patent: 4511858 (1985-04-01), Chararit et al.
patent: 4562410 (1985-12-01), O'Rourke
Ulrich L. Rohde, Ph.D., Sc.D., Digital PLL Frequency Synthesizers, N.J., Prentice-Hall, Inc., 1983, pp. 14-18.
Vadim Manassewitsch, Frequency Synthesizers Theory and Design, N.Y., John Wiley & Sons, 1976, pp. 258-264.

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