IEEE Journal of Solid-State Circuits · 2002 · 37 citations · 11 references
EngineeringElectrical EngineeringAnalog ElectronicsBiomedical Signal ProcessingMicrowave EngineeringCmos Circuit DesignDigital Signal ProcessingLow-noise Circuit DesignNoiseNoise PredictionNoise ReductionAdaptive EqualizationEqualizationFinite Impulse Response FiltersImpulse ResponseMagnetic RecordingMagnetic Recording MediaSignal-to-noise RatioSignal-to-noise Ratio Enhancement
In this paper, an adaptive noise-predictive decision-feedback equalizer (NPDFE) is presented. The NPDFE architecture and its implementation are described. The NPDFE consists of an analog finite-impulse-response (FIR) forward equalizer, a recursive analog equalizer for noise prediction, and a decision-feedback equalizer (DFE). The recursive equalizer reduces noise enhancement and improves the signal-to-noise ratio (SNR) at the decision slicer input. The prototype targets a magnetic recording channel modeled by a Lorentzian impulse response. Measured results show that compared to a conventional DFE with FIR forward equalizer, the NPDFE achieves a SNR improvement of about 2 dB with PW/sub 50/=2.5T. The NPDFE consumes 130 mW at a data rate of 100 Mb/s and occupies 1.3 mm/sup 2/ of die area in a 0.5-/spl mu/m CMOS process.
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