METHOD AND APPARATUS FOR BIASING A MAGNETORESISTIVE HEAD WITH CONSTANT POWER DISSIPATION

摘要

Methods and apparatus for biasing a magnetoresistive (MR) head (130) wherein the power dissipated by the MR head (130) is substantially constant are provided. A method of maintaining a constant power dissipation through the MR head (130) is provided wherein the head power dissipation is dynamically maintained at or near a desired level. Also provided is a disc drive (100) which includes a dynamic MR head power dissipation control loop (158) which continuously adjusts the bias current to achieve an essentially constant power dissipation through the MR head (130).