Patent ID: 6813110
Filing Date: 2004-11-02
Classification: G11B

Abstract:
A write driver circuit for selectively providing write current through a write head in first and second opposite directions, comprising:first and second pre-drive signal-providing sources; first and second active devices coupled respectively to the first and second pre-drive signal-providing sources; first and second pull-up resistors coupled respectively between the first and second active devices and a fixed voltage; first and second capacitors coupled respectively to the first and second active devices; third and fourth pre-drive signal-providing sources; third and fourth active devices coupled respectively to the third and fourth pre-drive signal-providing sources, the write head being connected between the third and fourth active devices; a third pull-up resistance, comprising first and second resistance components, coupled between the third active device and the fixed voltage, the first capacitor being connected between the first and second resistance components; a fourth pull-up resistance, comprising third and fourth resistance components, coupled between the fourth active device and the fixed voltage, the second capacitor being connected between the third and fourth resistance components; and lower current-carrying circuitry for pulling current from the third and fourth active devices through the write head.