Sampled amplitude read channel employing pipelined reads to reduce the gap between sectors

US6646822B1 · kind B1 · utility

Assignee

• CIRRUS LOGIC, INC. · US

Inventors

• Tyson Tuttle · Austin, US
• Diwakar Vishakhadatta · Austin, US
• Jerrel P. Hein · Driftwood, US
• David R. Welland · Austin, US
• David E. Reed · Westminster, US
• Richard T. Behrens · Louisville, US
• William G. Bliss · Thornton, US
• Paul M. Romano · Boulder, US
• Trent Dudley · Littleton, US
• Christopher P. Zook · Longmont, US

Key dates

• Filing date: Mar 12, 1997
• Grant date: Nov 11, 2003
• Expiry date: Aug 19, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B20/1258
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A sampled amplitude read channel incorporated within a magnetic disk storage system for reading data recorded tracks on a magnetic medium, where the data comprises user data sectors recorded at varying data rates across a plurality of predefined zones and embedded servo data sectors recorded at the same data rate across the zones. The read channel comprises a timing recovery component for synchronous sampling of a read signal from a magnetic read head positioned over the magnetic medium, a gain control component for adjusting the amplitude of the read signal, and a DC offset component for canceling a DC offset in the read signal. These components are dynamically configured to operate according to whether the read channel is processing user data or embedded servo data.