| 摘要 |
PROBLEM TO BE SOLVED: To solve problems of a conventional clock recovery circuit that has had problems such as increased number of circuits, increased cost and complicated circuitry because the conventional clock recovery circuit requires an arithmetic processing section and many additional circuits in addition to a temperature sensor for temperature compensation. SOLUTION: An analog/digital conversion means 2 digitizes reproduced data and a digital phase error detection means 3 takes a difference between an output signal from the A/D conversion means 2 and an output signal from an n/m frequency divider 7. A digital loop filter 4 applies filter processing to the difference signal, a digital/analog conversion means applies digital/analog conversion to the difference signal subjected to the filter processing and provides an output to a VCO 6 as its control signal. A temperature sensing digital/analog control means 8 outputs a D/A control signal in response to a temperature change around a PLL circuit 9 to the digital/analog conversion means 5 to control a relation in the digital/analog conversion of the digital/analog conversion means 5. |
