Design structures including multiple reference frequency...

Details Design structures including multiple reference frequency... Design structures including multiple reference frequency...

2007-10-16

2010-06-08

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C331S025000, C375S373000

Reexamination Certificate

active

07733137

ABSTRACT:
A design structure including a system. The system includes a fractional-N phase-locked loop (PLL). The PLL includes a PLL input and a PLL output. The fractional-N PLL further includes a multiplexer. The multiplexer includes a multiplexer output electrically coupled to the PLL input. The multiplexer further includes M multiplexer inputs, M being an integer greater than 1. Two or more reference frequencies are applied to the inputs of the multiplexer, by the selection of one from the reference frequencies, the low spur can be reached.

REFERENCES:
patent: 5276716 (1994-01-01), Wincn
patent: 7012471 (2006-03-01), Lyden et al.
patent: 7538622 (2009-05-01), Feng
patent: 2008/0208541 (2008-08-01), Cesky et al.
Office Action (Mail Date Sep. 18, 2008) for U.S. Appl. No. 11/696,268, filed Apr. 4, 2007; Inventor: Kai Di Feng; Confirmation No. 4115.
Notice of Allowance (Mail Date Jan. 23, 2009) for U.S. Appl. No. 11/696,268, filed Apr. 4, 2007; First Named Inventor Kai Di Feng; Confirmation No. 4115.

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