Method and apparatus for a high speed decision feedback...

Details Method and apparatus for a high speed decision feedback... Method and apparatus for a high speed decision feedback...

2005-12-12

2010-02-23

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Equalizers

Automatic

C333S018000, C333S02800T

Reexamination Certificate

active

07668238

ABSTRACT:
A method and apparatus for advantageously utilizing the reset state of an RTZ shift register to guarantee proper data alignment at the feedback taps to facilitate decision feedback equalization (DFE). An input data stream (DATA) is sliced into an even data stream and an odd data stream. Each bit of the even data stream is propagated through RTZ latches and each bit of the odd data stream is propagated through RTZ latches. At any given instant in time, half of the RTZ latch outputs contain zero information, so that each latch output may be summed in a current mode without the need for any intervening logic. The input data stream is then summed in current mode with the feedback data and converted to voltage prior to sampling of the currently received data bit.

REFERENCES:
patent: 6047026 (2000-04-01), Chao et al.
patent: 2005/0180498 (2005-08-01), Bhakta et al.
patent: 2007/0147559 (2007-06-01), Lapointe
U.S. Appl. No. 10/997,159, filed Nov. 24, 2004, Anderson et al.

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