Phase locked loop circuit having deadlock protection circuit...

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing

Reexamination Certificate

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Details

C327S157000, C327S147000

Reexamination Certificate

active

11291415

ABSTRACT:
A phase locked loop (PLL) circuit having a deadlock protection circuit and a deadlock protection method of the PLL circuit are provided. The PLL circuit includes: a phase frequency detector, which receives an input clock signal and a divided clock signal and compares the phase and frequency of the input clock signal with the phase and frequency of the divided clock signal; a charge pump, which receives an output signal of the phase frequency detector; a voltage-controlled oscillator, which oscillates in response to an output voltage of the charge pump; a main divider, which divides the frequency of an first output clock signal of the voltage-controlled oscillator and outputs the divided clock signal as the division result; and a deadlock protection circuit, which is electrically coupled to an output port of the voltage-controlled oscillator and an input port of the main divider, and divides the frequency of the first output clock signal of the voltage-controlled oscillator and then provides the division result to the main divider if the frequency of the first output clock signal of the voltage-controlled oscillator is above a threshold frequency.

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Notice to Submit Response, Korean Application No. 10-2004-0104633, May 25, 2006.

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