发明名称 |
High-speed parallel decision feedback equalizer |
摘要 |
A decision-feedback equalizer (DFE) can be operated at higher frequencies when parallelization and pre-computation techniques are employed. Disclosed herein is a DFE design suitable for equalizing receive signals with bit rates above 10 GHz, making it feasible to employ decision feedback equalization in silicon-based optical transceiver modules. One illustrative embodiment includes a front end filter to reduce leading intersymbol interference in a receive signal; a serial-to-parallel converter and at least one pre-compensation unit that together convert the filtered signal into grouped sets of tentative decisions, the sets in each group being made available in parallel; a set of pipelined DFE multiplexer units to select a contingent symbol decision from each set of tentative decisions to form groups of contingent symbol decisions based on a presumed sequence of preceding symbol decisions; and an output multiplexer that chooses, based on preceding symbol decisions, one of said groups of contingent symbol decisions. |
申请公布号 |
US9071479(B2) |
申请公布日期 |
2015.06.30 |
申请号 |
US201213594595 |
申请日期 |
2012.08.24 |
申请人 |
CREDO SEMICONDUCTOR (HONG KONG) LIMITED |
发明人 |
Qian Haoli;Lam Yat-tung;He Runsheng |
分类号 |
H03H7/30;H03H7/40;H03K5/159;H04L25/03;H04B10/69 |
主分类号 |
H03H7/30 |
代理机构 |
Krueger Iselin LLP |
代理人 |
Krueger Iselin LLP |
主权项 |
1. A high speed equalization method that comprises:
deriving at each of multiple consecutive time intervals a set of tentative decisions, each tentative decision accounting for a respective degree of trailing intersymbol interference; forming a parallel group from a series of said sets of tentative decisions; applying the parallel group to a set of pipelined DFE multiplexer units, each said unit selecting a contingent symbol decision from each set of tentative decisions in the group to form a group of contingent symbol decisions based on a different presumed sequence of preceding symbol decisions; and choosing, based on an actual sequence of preceding symbol decisions, one of said groups of contingent symbol decisions as a group of actual symbol decisions. |
地址 |
Hong Kong CN |