Minimum jitter‐based adaptive decision feedback equaliser for giga‐bit‐per‐second serial links

Abstract

This study presents a minimum jitter-based adaptive decision feedback equaliser (DFE) for giga-bit-per-second (Gbps) serial links. The adaptation in search for the optimal tap coefficients of DFE is carried out with the objective to minimise data jitter at the edge of data eyes. Jitter minimisation is achieved by adjusting the slope of the DFE that counteracts that of the channel. The effectiveness of the proposed adaptive DFE is evaluated by embedding the DFE in a 2 Gbps serial link. The data link is analysed using Spectre from Cadence Design Systems with BSIM4 device models. Simulation results demonstrate that the proposed adaptive DFE is capable of opening closed data eyes with 83% vertical opening, 68% horizontal opening and 16% data jitter over 1 m FR4 channel while consuming 15.45 mW.