PHASE AND FREQUENCY COMPARATOR, AND SERIAL TRANSMISSION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a phase and frequency comparator for stabilizing loop bandwidth with a simple circuit.

SOLUTION: This phase and frequency comparator which uses a reference clock 102 and a feedback clock 103 as inputs to output an up signal to a frequency synthesizer and a down signal to the frequency synthesizer is equipped with: a first phase and frequency comparison circuit 106; a second phase comparison circuit 107; and a delay circuit part 108 which uses the reference clock 102 and the feedback clock 103 as inputs and providing predetermined relative delay to the input of the first phase and frequency comparison circuit 106 and the input of the second phase comparison circuit 107. In the comparator, frequency comparison is performed by the first phase and frequency comparison circuit 106, and phase comparison is performed by the first phase and frequency comparison circuit 106 and the second phase comparison circuit 107 controlling a latch.

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