DIGITAL PHASE LOCKED LOOP AND OPERATING METHOD OF DIGITAL PHASE LOCKED LOOP
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United States of America
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Jan 4, 2018
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Jan 4, 2018
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A digital phase locked loop includes a digital phase detector, a digital loop filter, a digital controlled oscillator, a first divider that divides the second frequency of the oscillation signal depending on a first division value and outputs the division result as a division signal having a third frequency, a second divider that divides the second frequency of the oscillation signal depending on a second division value and outputs the division result as an output signal having a final frequency, a dithering block that receives the division signal and performs dithering on the first division value based on a preset pattern as cycles of the division signal pass, and a digital phase domain filter that performs second low pass filtering on the division signal in a phase domain and outputs the result of the second low pass filtering as the feedback signal.
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