PLL apparatus for OFDM system having variable channel bands...

Details PLL apparatus for OFDM system having variable channel bands... PLL apparatus for OFDM system having variable channel bands...

2007-10-26

2009-11-03

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S015000, C331S17700V, C331S182000

Reexamination Certificate

active

07612618

ABSTRACT:
Provided are a PLL apparatus for an OFDM system having variable channel band and an operating method thereof. The PLL apparatus includes a frequency divider for dividing an oscillating signal; a phase detector for detecting a phase difference between a reference signal and the divided oscillating signal from the frequency divider and outputting the phase difference signal; a variable loop filter for filtering a phase difference signal outputted from the phase detector; a voltage control oscillator for outputting the oscillator signal to the frequency divider according to the voltage control signal filtered from the variable loop filter; and a variable loop filter controller for varying a filtering band of the variable loop filter according to each of the channel bands.

REFERENCES:
patent: 5534823 (1996-07-01), Kondou
patent: 6408038 (2002-06-01), Takeuchi
patent: 6476681 (2002-11-01), Kirkpatrick
patent: 2007/0164829 (2007-07-01), Ko
patent: 07-086934 (1995-03-01), None
patent: 11-055115 (1999-02-01), None
patent: 1020010003432 (2001-01-01), None
patent: 1020010038734 (2001-05-01), None
patent: 1020060093759 (2006-08-01), None
patent: 1020060093929 (2006-08-01), None
KIPO Notice of Patent Grant dated Mar. 17, 2008 for the corresponding application KR 10-2007-0013852.

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