Mode switching method for PLL circuit and mode control...

Details Mode switching method for PLL circuit and mode control... Mode switching method for PLL circuit and mode control...

2005-03-08

2005-03-08

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C331SDIG002

Reexamination Certificate

active

06864729

ABSTRACT:
A method of switching the mode of a PLL circuit which has a high-speed mode and a normal mode, which allows the PLL circuit to be locked up at a high speed. The PLL circuit includes a phase comparator and a charge pump for generating a current depending on a comparison output signal from the phase comparator. The mode switching method includes the steps of detecting whether a current output terminal of the charge pump is in a high impedance state, and switching the mode of the PLL circuit from the high-speed mode to the normal mode or from the normal mode to the high-speed mode when the high impedance state is detected.

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Taiwan Office Action Dated Jan. 16, 2003 with English Translation.
European Search Report of Jul. 15, 2003.

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