SIGMA-DELTA BASED PHASE LOCK LOOP

A sigma-delta based phase lock loop device is provided that includes a phase frequency detector (PFD), a charge pump and a voltage controlled oscillator. The PFD to receive a reference signal and a feedback signal and to output signals based on a comparison of the reference signal and the feedback s...

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Bibliographic Details
Main Authors PARK, JOONBAE, LEE, KYEONGHO, SONG, EUNSEOK, KOO, YIDO, LEE, JEONG-WOO, AHN, YOUNGHO
Format Patent
LanguageEnglish
French
German
Published 10.12.2008
Subjects
BASIC ELECTRONIC CIRCUITRY
DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TOANOTHER
ELECTRICITY
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Summary:A sigma-delta based phase lock loop device is provided that includes a phase frequency detector (PFD), a charge pump and a voltage controlled oscillator. The PFD to receive a reference signal and a feedback signal and to output signals based on a comparison of the reference signal and the feedback signal. The charge pump to output a charge based on the output signals from the PFD. The charge pump including a first current source to apply a fixed amount of current and a second current source to apply a variable amount of current. The voltage controlled oscillator to output a clock signal based on the received charge from the charge pump.
Bibliography:Application Number: EP20050802909