| 摘要 |
PROBLEM TO BE SOLVED: To accurately reproduce clocks by simple circuit constitution by detecting whether an error is an accidental error or an error due to frequence deviation between a generated clock signal and input data, and outputting a switching signal to a clock generation circuit when a frequency deviation error occurs. SOLUTION: When the frequency of a clock signal LCK generated by a VCO 301 is sharply deviated from that of a clock signal TCK used for a transmission part 10A, an error detection circuit 310 detects the deviation as an error. The circuit 310 detects a difference between input data sampled on two points having respectively different phases in the clock signal LCK generated in a clock generation circuit 300 based on input NRZ data as an error signal. Whether the error is an occidental error or an error due to a frequency deviation between the generated clock signal and input data is detected, and in the case of a frequency deviation error, a switching signal S310 is outputted to a differential driver 307 and an in-phase driver 308 in the circuit 300. |
