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