Patent ID: 6275524
Filing Date: 2001-08-14
Classification: G11B,H03L

Abstract:
An apparatus for reducing the time required to acquire synchronization with an incoming data stream, said apparatus comprising:a first filter which receives an analog-based input signal and a feedback signal, performs equalization on the analog-based input signal and the feedback signal, and outputs an equalized signal based on the analog-based input signal and the feedback signal;an analog to digital converter which receives the equalized signal and the feedback signal and outputs a digital signal converted from the equalized signal in accordance with the feedback signal;a phase detector which receives the digital signal, detects a phase difference therefrom and outputs a signal corresponding to a magnitude of the phase difference;a second filter which receives and filters the signal corresponding to a magnitude of the phase difference and outputs a filtered signal corresponding to a magnitude of the phase difference; anda voltage controlled oscillator which receives the filtered signal corresponding to a magnitude of the phase difference and outputs the feedback signal;wherein said first filter performs equalization on the analog-based input signal and feedback signal in accordance with a function defined by an expression comprising a plurality of coefficients including a first coefficient, wherein only the first coefficient of the plurality of coefficients is set to a value of one and any remaining coefficients of the plurality of coefficients are set to a value of zero.