Patent ID: 7424053

Claim:
An equalization system for a data receiver, the system comprising a digital equalizer, which comprises: a digital filter comprising a plurality of fixed sets of taps; each of said sets of taps being suitable for different cable characteristics; and the digital equalizer further comprising a decision device for selecting an optimum set of taps; wherein said sets of taps are in an infinite impulse response (IIR) structure; wherein a set of taps is optimal for shorter cable lengths; wherein the system further comprises an analog filter and said set of taps cancels adaptation of the analog filter; wherein an output of the digital filter is fed to the decision device and an output of the decision device is fed back to the digital filter; wherein the decision device selects a set of taps by comparing performance of the system with each of said sets of taps that are individually selected; wherein the decision device comprises a measurement circuit for measuring the power of the noise output associated with said each of said sets of taps that are individually selected; and wherein the measurement circuit comprises a squarer and an accumulator.