Patent ID: 6975678
Filing Date: 2005-12-13
Classification: H04B,H04L

Abstract:
1. An apparatus for equalizing an input signal that has a pulse-width defined between a first edge and a second edge, comprising: an equalizer circuit that produces an equalized signal in response to the input signal and an equalizer control signal such that the equalizer control signal selectively controls a characteristic of the equalizer circuit to shape the equalized signal from the input signal; a data slicer circuit that produces a data signal in response to the equalized signal, the data signal corresponding to a digital representation of the equalized signal; a comparator circuit that produces a comparator output signal in response to a comparison between the equalized signal and a peak level signal; a sampling circuit that samples data points within a sampling window in response to the comparator output signal and the data signal, the sampling window having edges that correspond to the pulse-width of the input signal, wherein the sampled data points include a first sampled data point and a second sampled data point, the first sampled data point corresponding to a sample of the output of the comparator circuit after the first edge of the input signal, and the second sampled data point corresponding to another sample of the output of the comparator circuit in response to the data signal such that the sampled data points correspond to sampled points from the equalized signal within the pulse-width of the input signal; and a digital control logic circuit that produces the equalizer control signal in response to a persistent condition that is determined from the sampled data points such that the equalizer control signal adjusts the equalizer circuit in response to the persistent condition.