Adaptive data-transition decision feedback equaliser with edge emphasis

Adaptive data-transition (DT) decision feedback equalisation (DFE) with edge-emphasised (EE) taps is presented. DFE is performed when DT is detected using a loop-unrolling algorithm. EE-taps provide enhanced equalisation at the edges of data eyes, where the impact of channel impairment is most severe, and adequate equalisation between the edges and centre of data eyes to achieve both minimum jitter and maximum vertical eye-opening of equalised data. Reference voltages for measuring the DFE error signal are adjusted to further improve the vertical eye-opening of equalised data. The effectiveness of the proposed DFE is investigated using the simulation results of a 10 Gbps (gigabits per second) link over a backplane channel with -23.9 dB channel loss at the baud-rate in TSMC 65 nm 1.2 V CMOS technology. Simulation results show that DT-DFE with EE-taps improves vertical eye-opening by 3.9 times and lowers data jitter by 4.86 times.