PLL noise smoothing using dual-modulus interleaving

Details PLL noise smoothing using dual-modulus interleaving PLL noise smoothing using dual-modulus interleaving

2006-03-14

2006-03-14

Tse, Young T. (Department: 2637)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C327S156000, C331S025000

Reexamination Certificate

active

07012984

ABSTRACT:
The present invention, generally speaking, achieves noise spreading within a PLL using a dual-modulus prescaler by interleaving the division moduli. Within a given cycle, “ones” and “tens” are not all counted consecutively. Instead, ones and tens are interleaved. In one embodiment of the invention, the R count is doubled and the output of the R counter is toggled between high and low states. (The Q counter may remain unmodified.) In another embodiment of the invention, ones and tens are interleaved in accordance with a ratio q:r. By so interleaving the modulus, the effect is to spread the noise resulting from the output signal of the dual-modulus prescaler over a wider frequency range. The prescaler noise level is greatly reduced, particularly within the frequency band of the reference frequency.

REFERENCES:
patent: 4121162 (1978-10-01), Alberkrack et al.
patent: 4316151 (1982-02-01), Ooms
patent: 4325031 (1982-04-01), Ooms et al.
patent: 4484153 (1984-11-01), Borras et al.
patent: 4573023 (1986-02-01), Cok et al.
patent: 4660182 (1987-04-01), Bates et al.
patent: 4891774 (1990-01-01), Bradley
patent: 5424687 (1995-06-01), Fukuda
patent: 5640116 (1997-06-01), Kobayashi et al.
patent: 5867068 (1999-02-01), Keating
patent: 6140882 (2000-10-01), Sander
patent: 6236278 (2001-05-01), Olgaard
patent: 6369623 (2002-04-01), Heinen
patent: 6411669 (2002-06-01), Kim
Publication No. 404095, filed by Fox Enterprises, Inc., and Jet City Electronics, published on Sep. 2000, entitled “Programmable Crystal Oscillator”, PPS 1-20.

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