A PRML read/write channel IC using analog signal processing for 200 Mb/s HDD

Abstract

A PR4 read/write IC operating at 50-200 Mb/s while consuming 0.85 W is implemented in 0.5 /spl mu/m BiCMOS technology. The device integrates all of the read/write functions and, in addition, provides a servo demodulator and power management in a single 64-pin TQFP package. PR4 equalization is achieved via a continuous time filter and a 7-tap continuous time transversal equalizer using signed-signed least mean square adaptation.