Patent ID: 9692621
Date: 2017-06-27
CPC Classifications: H04L

Claim:
1. A decision feedback equalizer (DFE) comprising: a sampler configured to receive an input signal and to compare an amplitude of the input signal with a first predetermined voltage level and a second predetermined voltage level; a DFE logic circuit configured to receive at least one first sign signal based on comparison results from the sampler, and to selectively update a tap coefficient based on the at least one first sign signal; a latch configured to latch an input sign signal with an input data signal and to output at least one latched data signal and a latched sign signal, the input sign signal being based on the comparison from the sampler; and a demultiplexer configured to demultiplex the at least one latched data signal and the latched sign signal, and to output the at least one first sign signal to the DFE logic circuit, wherein the DFE logic circuit is configured to update the tap coefficient when the at least one first sign signal indicates the amplitude of the input signal is not between the first predetermined voltage level and the second predetermined voltage level, and the DFE logic circuit is configured to maintain the tap coefficient when the at least one first sign signal indicates the amplitude of the input signal is between the first predetermined voltage level and the second predetermined voltage level.