Method of switching PLL characteristics and PLL circuit

Details Method of switching PLL characteristics and PLL circuit Method of switching PLL characteristics and PLL circuit

2005-07-26

2008-03-04

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S552000, C327S553000, C331S03600C

Reexamination Certificate

active

07339420

ABSTRACT:
A loop filter which is a component of a PLL circuit includes a switching element for switching a capacitance value which connects and disconnects a second capacitive element to a first capacitive element according to a natural angular frequency switching signal, and a switching element for switching a resistance value which short-circuits and opens between both ends of a resistance element according to a natural angular frequency switching signal in order to keep a damping factor at a constant value. It further includes an operational amplifier for charging the second capacitive element at the same potential as the first capacitive element when the second capacitive element is isolated from the first capacitive element.

REFERENCES:
patent: 4783635 (1988-11-01), Sevastopoulos
patent: 5570398 (1996-10-01), Smith
patent: 6583675 (2003-06-01), Gomez
patent: 6727763 (2004-04-01), Endo
patent: 2004/0021507 (2004-02-01), Fischer
patent: 2005/0024132 (2005-02-01), Laletin
J. Briaire, et al.; “Substrate Injection and Crosstalk in CMOS Circuits,” IEEE Custom Integrated Circuits Conference 1999, pp. 483-486.

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