PHASE LOCKED LOOP (PLL) APPARATUS AND OPERATING METHOD OF PLL APPARATUS
First Claim
1. A phase locked loop (PLL) apparatus comprising:
- a PLL unit to provide a fixed frequency signal;
a converter to convert, using the fixed frequency signal, a frequency of a first signal oscillated by a first voltage-controlled oscillator (VCO) based on a first control voltage;
a first frequency divider to divide the converted frequency of the first signal; and
a first phase comparator to compare the divided frequency of the first signal to an input first reference frequency and detect a first phase difference,wherein the first VCO adjusts the first control voltage based on the detected first phase difference to equalize the divided frequency of the first signal to the first reference frequency.
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Abstract
Provided are a phase locked loop (PLL) apparatus and an operating method of the PLL apparatus including a PLL unit to provide a fixed frequency signal, a converter to convert, using the fixed frequency signal, a frequency of a first signal oscillated by a first voltage-controlled oscillator (VCO) based on a first control voltage, a first frequency divider to divide the converted frequency of the first signal, and a first phase comparator to compare the divided frequency of the first signal to an input first reference frequency and detect a first phase difference, wherein the first VCO may adjust the first control voltage based on the detected first phase difference to equalize the divided frequency of the first signal to the first reference frequency.
7 Citations
16 Claims
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1. A phase locked loop (PLL) apparatus comprising:
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a PLL unit to provide a fixed frequency signal; a converter to convert, using the fixed frequency signal, a frequency of a first signal oscillated by a first voltage-controlled oscillator (VCO) based on a first control voltage; a first frequency divider to divide the converted frequency of the first signal; and a first phase comparator to compare the divided frequency of the first signal to an input first reference frequency and detect a first phase difference, wherein the first VCO adjusts the first control voltage based on the detected first phase difference to equalize the divided frequency of the first signal to the first reference frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An operating method of a phase locked loop (PLL) apparatus, the method comprising:
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providing a fixed frequency signal, by a PLL unit; converting, using the fixed frequency signal, a frequency of a first signal oscillated by a first voltage-controlled oscillator (VCO) based on a first control voltage, by a converter; dividing the converted frequency of the first signal, by a first frequency divider; comparing the divided frequency of the first signal to an input first reference frequency and detecting a first phase difference, by a first phase comparator; and adjusting the first control voltage based on the detected first phase difference to equalize the divided frequency of the first signal to the first reference frequency, by the first VCO. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification