Apparatus and method for detecting a phase difference
AssigneeRealtek Semiconductor Corp.
InventorsHan-Chang Kang, Chao-Cheng Lee
Life of this patent
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Abstract
A method for detecting a phase difference between a first input signal and a second input signal is provided. The method contains: detecting the phase difference of the first and the second input signals to produce an output signal; generating a first voltage according to a first level of the output signal; generating a second voltage according to a second level of the output signal; and comparing the first voltage and the second voltage to produce the information regarding the phase difference between the first and the second input signals.
Claims20
A method for detecting a phase difference between a first input signal and a second input signal, comprising:
- receiving the first and the second input signals and outputting a phase difference signal of the first and the second input signals;
- generating a first voltage according to a first level of the phase difference signal and generating a second voltage according to a second level of the phase difference signal;
- and
- comparing the first voltage and the second voltage after a predetermined number of cycles to produce a comparison value that represents the phase difference between the first and the second input signals.
An apparatus for detecting a phase difference between a first input signal and a second input signal, comprising:
- a detecting circuit utilized for receiving the first and the second input signals to output a phase difference signal of the first and the second input signals;
- a charge pump module utilized for respectively generating a first voltage according to a first level of the phase difference signal and generating a second voltage according to a second level of the phase difference signal;
- and
- a comparing circuit utilized for comparing the first voltage and the second voltage after a predetermined number of cycles to produce a comparison signal that represents the phase difference between the first and the second input signals.
Dependencies are inferred from the claim text.