Patent ID: 9571309
Date: 2017-02-14
CPC Classifications: H04L

Claim:
1. A decision feedback equalizer comprising: a plurality of comparator circuits which output comparison results of comparisons between a pulse amplitude modulated input signal with four or more values and a plurality of first thresholds; a selection section which decides a value of the input signal at first timing by selecting one of the comparison results outputted from the plurality of comparator circuits on the basis of a decision result of a value of the input signal at second timing before the first timing; and a threshold setting section which generates the plurality of first thresholds from a plurality of third thresholds obtained by adding an offset value based on a magnitude of an inter-symbol interference corresponding to each of the values to one of a plurality of second thresholds whose number is based on a number of the values, based on a first average value of the plurality of third thresholds greater than a second threshold or a second average value of the plurality of third thresholds smaller than the second threshold and an adjustment value based on the decision result and which sets the plurality of first thresholds in the plurality of comparator circuits.