SPREAD SPECTRUM CLOCK GENERATION CIRCUIT, CLOCK TRANSFER CIRCUIT, INTEGRATED CIRCUIT, AND IMAGE READING APPARATUS

摘要

A spread spectrum clock generation circuit includes a generation unit configured to generate and output a spread spectrum clock based on an input reference clock, a monitoring unit configured to monitor a difference between the number of pulses of a reference clock input to the generation unit after a reference time and the number of pulses of a spread spectrum clock output from the generation unit after the reference time, and a control unit configured to control a frequency of a spread spectrum clock to be generated by the generation unit so as to make the difference fall within a predetermined range.

主权项

1. A spread spectrum clock generation circuit comprising:
a generation unit configured to generate and output a spread spectrum clock based on an input reference clock; a monitoring unit configured to monitor a difference between the number of pulses of a reference clock input to said generation unit after a reference time and the number of pulses of a spread spectrum clock output from said generation unit after the reference time; and a control unit configured to control a frequency of a spread spectrum clock to be generated by said generation unit so as to make the difference fall within a predetermined range.