Rader, Fishman & Grauer
Clock reproduction circuit and data transmission apparatus
 A clock reproduction circuit capable of accurately reproducing a clock with a simple circuit structure and a data transmission apparatus capable of handling a wide range of transfer rates, having a reproduced clock signal which can quickly track a transmission clock, and not requiring an increase of the transmission media, wherein provision is made of a reception unit (clock reproduction circuit) having a clock generation circuit for generating a clock signal based on transmission data when a switch signal is not input and generating a clock signal locked to a frequency of a reference clock signal based on the reference clock signal when a switch signal is input; and an error detection circuit for defining a difference of input data sampled at a plurality of points having different phases of the clock signal generated at the clock generation circuit as an error, detecting whether the related error is a chance error or an error due to a deviation of the frequency between the generated clock signal and the input data and outputting the switch signal to the clock generation circuit in the case of frequency deviation error. 
Sony Corporation
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Hidekazu
Kikuchi