Apparatus and Method for Decision Feedback Equalization

摘要

Disclosed is an apparatus including an odd data receiving unit (710), an even data receiving unit (720), and a pattern filter (730). The odd data receiving unit (710) samples a half-rate DFE equalized signal with an odd data timing clock to output data decision data (711). The odd data receiving unit (710) also samples both the half-rate DFE equalized waveform and a non-half-rate DFE equalized signal with an odd edge timing clock having the phase shifted by 90 degrees from the odd data timing clock to output resulting edge decision data (712,713). The even data receiving unit (720) samples the half-rate DFE equalized waveform with an even data timing clock having the phase shifted by 180 degrees from the odd data timing clock to output data decision data (721). The even data receiving unit (720) also samples both the half-rate DFE equalized waveform and the non-half-rate DFE equalized waveform with an even edge timing clock having the phase shifted by 90 degrees from the even data timing clock to output resulting edge decision data (722,723). The pattern filter (730) selects one of the edge decision data sampled at the odd edge timing and at the even edge timing in response to the value of a data pattern of three consecutive bits (110 or 001) obtained from the data decision data sampled at the odd and even data timings