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등록 채널 대역이 가변적인 OFDM 시스템 PLL 장치 및 그 동작 방법

채널 대역이 가변적인 OFDM 시스템 PLL 장치 및 그 동작 방법
이미지 확대
발명자
고윤수, 이광천, 김성민
출원번호
11925073 (2007.10.26)
공개번호
20080129391 (2008.06.05)
등록번호
7612618 (2009.11.03)
출원국
미국
협약과제
초록
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 제안 키워드
Control Signal, Difference signal, Frequency Divider, OFDM systems, Phase Difference, Reference signal, Voltage control, Voltage controlled oscillator(VCO), loop-filter(LF), phase detector(PD)