Patent ID: 9071481
Filing Date: 2015-06-30
Classification: H04B,H04L

Abstract:
1. A method for calibrating a decision feedback equalizer, the decision feedback equalizer having a first sampling circuit configured to produce a first output signal representing samples at a first set of sample instants corresponding to a first phase of an input signal, and a second sampling circuit configured to produce a second output signal representing samples at a second set of sample instants corresponding to a second phase of the input signal, the method comprising: causing the first output signal to represent a comparison between the input signal and a first reference of the first sampling circuit; receiving the input signal during a first calibration period, the input signal having first input symbols corresponding to the first phase of the input signal and second input symbols corresponding to the second phase of the input signal, the first input symbols including a first pattern and the second input symbols having a first level during the first calibration period; obtaining the first output signal sampled from the first pattern using the first reference of the first sampling circuit; and comparing the first pattern and the first output signal to determine a first adjusted reference of the first sampling circuit.