Adjustable writer overshoot for a hard disk drive write head
AssigneeTexas Instruments Incorporated
InventorPATRICK M. TETERUD
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Abstract
An improved write drive circuit which provides an adjustable writer drive current and overshoot transient for a H-bridge drive circuit in a hard disk drive. The invention uses a variable capacitor circuit to give an initial boost to the write driver transistors. In a preferred embodiment, the capacitance of the variable capacitor is controlled by a word written to the disk drive pre-amp over the serial control port.
Claims16
A hard disk drive for a computer system comprising:
- a. one or more platters having magnetic media on one or more surfaces;
- b. a write head associated with at least one of said surfaces having magnetic media;
- c. an H-bridge circuit capable of driving a current through said write head, said H-bridge circuit comprising two upper transistors and two lower transistors;
- and
- d. a circuit to supply an adjustable initial drive current to drive said H-bridge circuit.
An integrated circuit for driving a write head of a hard disk drive comprising:
- a. an H-bridge circuit capable of driving a current through said write head, said H-bridge circuit comprising two upper transistors and two lower transistors;
- and
- b. a circuit to supply an adjustable initial drive current to drive said H-bridge circuit
The integrated circuit of claim 13 wherein said programmable connections to said transistor gates includes an array of capacitors with at least one terminal connected to a transistor and the gate of said transistor enabled by an enable register for programmable control of the connections of said array of capacitors.
Dependencies are inferred from the claim text.