PLL with low spurs

Details PLL with low spurs PLL with low spurs

2007-05-16

2009-06-02

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S147000

Reexamination Certificate

active

07541850

ABSTRACT:
A PLL circuit having a low spur output. The PLL circuit includes a PFD (Phase-Frequency Detector), a charge-pump coupled to the PFD, an SCR (switch-capacitor resistor) coupled to the charge pump, a filter coupled to the SCR, and a VCO circuit coupled to the filter, wherein the SCR reduces an amplitude of a plurality of current pulses at an output of the charge-pump before the plurality of current pulses reach an input of the VCL circuit.

REFERENCES:
patent: 5410263 (1995-04-01), Waizman
patent: 6420917 (2002-07-01), Klemmer
patent: 7145400 (2006-12-01), Horan
patent: 2007/0096835 (2007-05-01), Chien

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