| 摘要 |
A test circuit to test an equalizer is disclosed. Pseudo-random number data is generated by a pseudo-random number data generation unit. A weight coefficient is generated by a weight coefficient generation unit in order to set interference strength of intersymbol interference. In a pseudo-intersymbol interference data generation unit, pseudo-intersymbol interference is generated according to a bit sequence of the pseudo-random number data, and pseudo-intersymbol interference data is outputted. An amplitude of the pseudo-intersymbol interference data is changed according to the weight coefficient. A driver converts the pseudo-intersymbol interference data into a differential signal. A comparison unit compares the pseudo-random number data generated by the pseudo-random number data generation unit with output data obtained from the equalizer, when the differential signal outputted from the driver is inputted into the equalizer. A count unit counts the number of unmatched data detected by the comparison unit.
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