Adaptive equalizer circuit

Details Adaptive equalizer circuit Adaptive equalizer circuit

2005-06-07

2005-06-07

Chin, Stephen (Department: 2634)

Pulse or digital communications

Equalizers

Automatic

C375S229000, C375S230000, C375S231000, C375S233000, C375S234000

Reexamination Certificate

active

06904086

ABSTRACT:
An adaptive equalizer processing an input having a fluctuating amplitude realizes a stable adaptive equalization operation without changing over a reference value for computing an equalization error. An input signal is held as a sample with a timing signal shifted from a reference clock of the input signal by a phase of½cycle. An equalization output is compute from sample data. The difference between only the first output value after a zero-crossing and an arbitrary reference value is computed, and the computed value is set as an equalization error. A coefficient of the adaptive equalization circuit is updated from the equalization error and the sample data. To stabilize for displacement of symmetry of the input, the reference value of the equalizer is changed corresponding to the change of a digitization threshold value of a digitization circuit which constitutes a rear stage of the adaptive equalizer.

REFERENCES:
patent: 5036296 (1991-07-01), Yoshida
patent: 5768313 (1998-06-01), Kuribayashi
patent: 6208481 (2001-03-01), Spurbeck et al.
patent: 6414990 (2002-07-01), Jonsson et al.
patent: 09-321671 (1997-12-01), None

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