채널 대역이 가변적인 OFDM 시스템 PLL 장치 및 그 동작 방법
고윤수, 이광천, 김성민
- 7612618 (2009.11.03)
- 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)