Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
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
Cox Cassandra
PICO Semiconductor, Inc.
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