Patent ID: 8305704
Filing Date: 2012-11-06
Classification: G11B

Abstract:
1. A system for writing data onto a magnetic disk, the system comprising: an output driver configured to provide a first write current through a first output transistor in a first state and to provide a second write current through a second output transistor in a second state, the first and second write currents being provided to a disk write head to store opposing binary values, respectively, on the magnetic disk; a disk write predriver comprising a bias current generator that is configured to switch a first bias current between an intermediate voltage node in the second state and a first control node in the first state and to switch a second bias current between the intermediate voltage node in the first state and a second control node in the second state, the first and second bias currents being provided to set a bias voltage at the first and second control nodes to bias the first and second output transistors, respectively, wherein the bias current generator comprises a first switch that interconnects a first current source and the first control node, a second switch that interconnects the first current source and the intermediate voltage node, a third switch that interconnects a second current source and the second control node, and a fourth switch that interconnects the second current source and the intermediate voltage node, the first and second current sources being configured to generate the first and second bias currents, respectively, and wherein the first and second states correspond to first and second logic-states of a pulse signal, and wherein the first and fourth switches are activated substantially concurrently based on the first state of the pulse signal and the second and third switches are activated substantially concurrently based on the second state of the pulse signal.