Patent ID: 6922440

Claim:
An apparatus including adaptive circuitry for introducing a compensating signal latency related to a signal latency of a data symbol decision circuit, comprising: a first signal terminal that conveys a pre-decision data signal having a data symbol period associated therewith; a second signal terminal that conveys an error signal corresponding to a difference between an adaptive signal and a post-decision data signal which corresponds to and follows said pre-decision data signal by a first signal latency; and adaptive timing interpolation circuitry, coupled to said first and second signal terminals, that receives said error signal and in response thereto receives and adaptively processes said pre-decision data signal to provide said adaptive signal following said pre-decision data signal by a second signal latency related to said first signal latency; wherein said adaptive timing interpolation circuitry includes interpolating mixer circuitry, coupled to said first signal terminal, that receives and mixes an integrated signal and said pre-decision data signal to provide said adaptive signal, phase detection circuitry, coupled to said second signal terminal and said interpolating mixer circuitry, that receives and detects a phase difference between said error signal and said adaptive signal to provide a detection signal, and signal integration circuitry, coupled to said phase detection circuitry and said interpolating mixer circuitry, that receives and integrates said detection signal to provide said integrated signal; and wherein said interpolating mixer circuitry includes fractional delay circuitry, coupled to said first signal terminal, that receives and delays said pre-decision data signal to provide a delayed signal corresponding to and following said pre-decision data signal by a fraction of said data symbol period, signal weighting circuitry, coupled to said first signal terminal and said fractional delay circuitry, that receives said integrated signal and in response thereto receives and weights said pre-decision data signal and said delayed signal to provide first and second weighted signals, and signal combining circuitry, coupled to said signal weighting circuitry, that receives and combines said first and second weighted signals to provide said adaptive signal.