Spread spectrum control PLL circuit and its start-up method

Details Spread spectrum control PLL circuit and its start-up method Spread spectrum control PLL circuit and its start-up method

2011-07-26

2011-07-26

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S151000, C327S156000, C327S160000

Reexamination Certificate

active

07986175

ABSTRACT:
A calibration circuit (19) adjusts at least one of one of a charging current of a charge pump circuit (12) and a capacitance value of a filter capacitor in a loop filter circuit (13) and a gain of a voltage controlled oscillator (14), depending on a frequency of a reference clock signal input to a calibration circuit (10).

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patent: 2006/0176933 (2006-08-01), Uemura et al.
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patent: 2006-180428 (2006-07-01), None
patent: 2006-197308 (2006-07-01), None
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Japanese Notice of Reasons for Rejection, w/ English translation thereof, issued in Japanese Patent Application No. JP 2009-516160 dated Jun. 29, 2010.

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