DECISION FEEDBACK EQUALIZER AND RECEIVER CIRCUIT

摘要

A plurality of comparator circuits output results of comparing a pulse amplitude modulated input signal having four or more values with a plurality of first thresholds. A selection section decides a value of the input signal at certain timing by selecting one of the comparison results on the basis of a result of deciding a value of the input signal at previous timing. A threshold setting section generates the first thresholds from a plurality of third thresholds obtained by adding an offset value based on magnitude of inter-symbol interference corresponding to each value to one of second thresholds whose number is based on the number of values, on the basis of an average value of third thresholds greater than a second threshold or third thresholds smaller than the second threshold and an adjustment value based on the decision result and sets the first thresholds in the comparator circuits.

主权项

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.