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Registered PLL APPARATUS FOR OFDM SYSTEM HAVING VARIABLE CHANNEL BANDS AND OPERATING METHOD THEREOF

채널 대역이 가변적인 OFDM 시스템 PLL 장치 및 그 동작 방법
이미지 확대
Inventors
Ko Yun Soo, Kwangchun Lee, Seong-Min Kim
Application No.
11925073 (2007.10.26)
Publication No.
20080129391 (2008.06.05)
Registration No.
7612618 (2009.11.03)
Country
UNITED STATES
Project Code
06MM1700, Development of Multimode Base Station, Kim Jinup
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.
KSP Keywords
Control Signal, Difference signal, OFDM systems, Phase Difference, Voltage control, frequency divider, loop-filter(LF), phase detector(PD), reference signal, voltage control oscillator