Fractional multi-modulus prescaler

Details Fractional multi-modulus prescaler Fractional multi-modulus prescaler

2006-04-25

2006-04-25

Tran, Khai (Department: 2637)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S327000, C375S373000, C375S375000, C331S016000, C455S260000

Reexamination Certificate

active

07035367

ABSTRACT:
A fractional multi-modulus prescaler is disclosed wherein the output of the VCO is separated into four signals 90 degrees phase-related to one another. The phase signals are selected by a multiplexer for application of a division function during the modulus time period. The multiplexer is returned to the original selected phase prior to responding to a subsequent phase select control signal, whereby the generation of multi-modulus spurious frequency signals is prevented.

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patent: WO 01/45263 (2001-06-01), None
Craninckx J et al: “A 1.75-GHZ/3-V Dual-Modulus Divide-by-128/129 Prescaler in 0.7-MUM CMOS”, IEEE Journal of Solid-State Circuits, IEEE Inc. New York, US, vol. 31, No. 7, Jul. 1, 1996, pp. 890-897, XP000632373.

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