Patent ID: 6252450
Filing Date: 2001-06-26
Classification: G11B

Abstract:
A drive circuit for the write head of a disk storage device, comprising:a first pull-up device coupled to a first terminal of the write head;a first current sink coupled to the first terminal of the write head and capable of sinking a current from the first terminal of the write head;a second current sink coupled to the first terminal of the write head and capable of sinking a current from the first terminal of the write head;a circuit coupled to the second terminal of the write head for sourcing a current to the write head approximately when the first current sink is activated and sinking a current from the write head approximately when the first current sink is deactivated; andcontrol circuitry for activating the first current sink, the first pull-up device and the second current sink, so that the drive circuit acts as a voltage mode drive circuit during at least a portion of the time current flowing through the write head changes direction and as a current mode drive circuit otherwise, the second current sink being activated for a first portion of the time the first current sink is activated and the first pull-up device being activated for a second portion of the time the first current sink is activated substantially immediately following the first portion of time.