Patent ID: 7035330

Claim:
An apparatus including a decision feedback equalizer with dynamic feedback control for adaptively controlling a pre-slicer data signal that is sliced to provide a post-slicer data signal, comprising: first signal combining circuitry that combines a feedback signal and an input signal representing a plurality of data to provide a pre-slicer signal; signal slicing circuitry, coupled to said first signal combining circuitry, that slices said pre-slicer signal to produce a post-slicer signal indicative of said plurality of data; decision feedback circuitry including input signal timing control, coupled to said signal slicing circuitry, that feeds back said post-slicer signal in response to a control signal to produce said feedback signal; second signal combining circuitry, coupled to said signal slicing circuitry, that combines said pre-slicer and post-slicer signals to produce a difference signal indicative of a difference between said pre-slicer and post-slicer signals; signal differentiation circuitry with a selected signal delay that differentiates and delays said input signal to produce a resultant signal, wherein respective portions of said resultant signal are delayed relative to corresponding portions of said input signal by said selected signal delay; and third signal combining circuitry, coupled to said second signal combining circuitry and said signal differentiation circuitry, that combines said difference signal and said resultant signal to produce said control signal, wherein said selected signal delay is selected such that said control signal has a substantially zero alternating current (AC) signal component.