Patent ID: 9336803
Filing Date: 2016-05-10
CPC Classification: G11B

Claim Text:
1. An apparatus for two-dimensional magnetic recording, comprising: a storage medium; an array of magnetoresistive read heads disposed adjacent the storage medium and spaced to read a data track, wherein the array of magnetoresistive read heads share a common terminal; a plurality of leads connected to the array of magnetoresistive read heads, with one lead for each of the magnetoresistive read heads, plus a common lead connected to the common terminal, wherein each of the plurality of leads other than the at least one common lead are referenced to the at least one common lead; a preamplifier connected to the array of magnetoresistive read heads by the plurality of leads and operable to perform pseudo-differential sensing of signals from the array of magnetoresistive read heads, wherein the preamplifier is configured to apply replica biasing to set a standing current of an input stage; and a voltage driver connected to the common terminal, configured to control a DC voltage on the common lead.