Fractional divided frequency synthesizer with phase error compen

Details Fractional divided frequency synthesizer with phase error compen Fractional divided frequency synthesizer with phase error compen

1997-10-10

1998-12-08

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 10, 331 17, 331 25, H03L 7197

Patent

active

058476113

ABSTRACT:
In a frequency synthesizer, a variable frequency divider divides the oscillation signal of a VCO while switching the frequency dividing ratio in accordance with an integral frequency dividing ratio generated by a frequency dividing ratio generating circuit. The VCO is controlled with an output of a loop filter. The frequency dividing ratio generating circuit includes multiple integrators connected in cascade and differentiators which differentiate the carry-out signals of the integrators, so that a phase error generated at the variable frequency divider is obtained from an output of an adder included in the final stage integrator of the frequency dividing ratio generating circuit. A phase error compensation value is output, and further a pulse width of a signal to be used for compensating for phase error is varied in accordance with the phase error compensation value to perform compensation for the phase error.

REFERENCES:
patent: 5093632 (1992-03-01), Hietala et al.
patent: 5180993 (1993-01-01), Dent
patent: 5414391 (1995-05-01), Hori
Adachi, Hisashi et al., High-Speed Frequency-Switching Synthesizer Using Fractional N Phase-Locked Loop, Electronics and Communications in Japan, Part 2, vol. 77, No. 4, (New York, Apr. 1994), pp. 20-28.

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