ELECTRIC DISPERSION EQUALIZING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide an FFE type electric dispersion equalizing circuit easily adjusting a delay time and a band in respective signal routes to be desired values.

SOLUTION: The electric dispersion equalizing circuit includes at least: first to third delay circuits 11-13 which are serially cascaded so as to sequentially delay input signals from an input terminal IN by a fixed delay time; first to fourth multiplication circuits 21-24 for respectively multiplying the input signals to be input from the input terminal IN and the respective delay circuits by previously designated tap coefficients a1-a4; and first to third addition circuits 31-33 for outputting the results obtained by sequentially adding the input signals to be respectively input from the respective multiplication circuits. Electric capacities C1-C4are connected between the output signal lines of the respective multiplication circuits and a grounding part, so as to adjust the capacity values of the electric capacities C1-C4to obtain the desired characteristics. The circuit may be provided with a configuration where the electric capacities are connected at least to the output signal lines or to within the circuits of some circuits out of the first to third delay circuits 11-13 and the first to fourth multiplication circuits 21-24.

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