JITTER DETECTING CIRCUIT, RECEIVING CIRCUIT INCLUDING THE SAME, AND COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a control system which makes a reception sensitivity control parameter determining the reception sensitivity of an optical receiving circuit automatically follow up an optimum position by using the jitter quantity of a binary equalized data signal obtained by binarizing a received signal as a parameter representing the received signal quality.

SOLUTION: The binary equalized data signal outputted from a limiter amplifier 4 and a clock extracted by a clock extracting circuit 6 are inputted to a jitter detecting circuit 7. The jitter detecting circuit 7 outputs a voltage corresponding to the jitter quantity of the binarized equalized data signal. A control circuit 8 receives the output of the jitter detecting circuit 7, performs arithmetic processing by using a DSP, etc., and controls the identification voltage Vth 9 of the limiter amplifier 4 so that the jitter quantity (the output of the jitter detecting circuit 7) of the binary equalized data signal becomes minimum.

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