Browse Prior Art Database

AC Biased Read Head

IP.com Disclosure Number: IPCOM000085166D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Brock, GW: AUTHOR [+3]

Abstract

A multitrack magnetoresistive (MR) head is biased by alternating current to eliminate noise and expensive isolation circuits.

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AC Biased Read Head

A multitrack magnetoresistive (MR) head is biased by alternating current to eliminate noise and expensive isolation circuits.

Conventional multitrack MR head read elements are individually biased by separate direct-current sources isolated from each other. Here, instead, a single high-frequency bias signal (up to the gigahertz region) is connected to all head elements such as, for example, a passive capacitance network (tapped coaxial cable or printed-circuit cable) or other conventional means.

Individual read signals are detected by low-pass filters which may be coaxial cables, printer cables or other conventional circuits or a combination of these.

The inductive networks form a low-pass filter that blocks the high-frequency bias signal but passes the lower frequency read signal, thereby performing the signal demodulations.

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