DATA IDENTIFICATION DEVICE AND ERROR MEASUREMENT DEVICE

摘要

It is an object to provide a data identification device and an error measurement device which are not necessary for processing of a phase continuous sweep, which can set a clock phase to the most suitable state with respect to a data signal, and which keep the most suitable state for a long time. The data identification device is comprised of a delay circuit (34) which delays a data signal (Dc) output from an identifying circuit (31) by one bit, a first phase detector (35) for detecting a phase difference between a data signal (Db) input to the identifying circuit (31) and the data signal (Dc) output from the identifying circuit (31), a second phase detector (36) for detecting a phase difference between the data signal (Dc) output from the identifying circuit (31) and the data signal (Dd) output from the delay circuit (34), a third phase detector (37) for outputting a voltage which is a base with respect to output values of the first and second phase detectors(35) and (36), and a phase control means (38) for controlling a phase of a variable delay circuit (32) so that an output value (P1) of the first phase detector (35) is made to be equal to an intermediate value between an output value (P2) of the second phase detector (36) and a basic voltage (P3) of the second phase detector (36).