Sequence generator for fractional frequency divider in PLL frequ

Details Sequence generator for fractional frequency divider in PLL frequ Sequence generator for fractional frequency divider in PLL frequ

1999-03-02

2000-05-30

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 331 25, 332127, 377 48, H03C 309, H03L 7197

Patent

active

060695358

ABSTRACT:
A sequence generator 10 for a frequency synthesiser 1,2,3,4,5,10 forming part of a direct modulator comprises an input 10a for receiving an input multibit signal X(z), an output 10c for outputting an output digital signal Y(z) and sequence generation means 10b. The sequence generation means is adapted to produce a noise transfer function which has a minimum value both at the frequency corresponding to the dc component of the input signal and at one or more frequencies away from the frequency corresponding to the dc component of the input signal.

REFERENCES:
patent: 5166642 (1992-11-01), Hietala
patent: 5495206 (1996-02-01), Hietala
"A Multiple Modulator Fractional Divider", Miller, IEEE Transactions on Instrumentation and Measurement, vol. 40, No. 3, Jun. 1991, New York, US, pp. 578-583.
"Delta-Sigma Modulation in Fractional-N Frequency Synthesis", Riley et al., IEEE Journal of Solid-State Circuits, vol. 28, No. 5, May 1993, New York, pp. 553-559.

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