Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2011-08-23
2011-08-23
Lugo, David B (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
C375S348000, C375S350000
Reexamination Certificate
active
08005135
ABSTRACT:
An analog equalizer (613and614) adaptively equalizes an input analog signal affected with intersymbol interference (“ISI”), or an intermediate analog signal generated therefrom, to produce a filtered partially equalized analog signal with reduced ISI. An analog-to-digital converter (210) converts the filtered analog signal, or an intermediate analog signal generated therefrom, into an initial digital signal. A digital equalizer (212) adaptively equalizes the initial digital signal, or an intermediate digital signal generated therefrom, to produce an equalized digital signal as a stream of equalized digital values with further reduced ISI. An output decoder (605) decodes the equalized digital values, or intermediate digital values generated therefrom, into a stream of symbols. Equalization control circuitry (213, 214,and217) adjusts equalization filter characteristics of the equalizers such that adjustments of the filter characteristics of one of the equalizers depend adaptively on adaptive adjustments of the filter characteristics of the other equalizer.
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Manickam Tulsi
Phanse Abhijit M.
Raghavan Sreen A.
Sallaway Peter J.
Wieser James B.
Lugo David B
Meetin Ronald J.
National Semiconductor Corporation
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