Method of adaptively controlling a low frequency equalizer
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United States of America Patent
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Jun 12, 2018
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app pub date -
Dec 15, 2016
filing date -
Dec 15, 2016
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Abstract
A circuit and method for adaptively controlling an equalizer circuit to reduce intersymbol interference at low frequencies relative to a transmit frequency of an input signal from a transmitter. The input signal is converted into a data signal by a receiver. At least one delayed data signal is formed by delaying the data signal by at least one unit interval (UI) beyond a length of a decision feedback equalizer (DFE) in the receiver. An error signal is formed by comparing the input signal to a threshold value. An error signal sample is correlated with at least one delayed data signal sample to determine whether to adjust a control coefficient of the equalizer. Thus the equalizer is controlled as if the DFE had at least one additional tap.
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