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US 2003/0189447 A1Published application
System and method for enhancing write driver performance
AssigneeTexas Instruments Incorporated
InventorJohn J. Price JR.
Life of this patent
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Abstract
A technique for presenting an optimally timed control signal to an upper H-switch driver in a fashion capable of achieving a very fast transition of the current in the inductive recording head. The technique also provides a current boost during the transition while resulting in minimized power consumption at other times.
Claims10
A write current driver circuit comprising:
- an H-switch driver having first and second upper switches and further having first and second lower switches, wherein the H-switch driver is operational to direct write current in opposite directions through a write head connected between a first node connecting the first upper switch to the first lower switch and a second node connecting the second upper switch to the second lower switch in response to first and second input signals;
- a first current pulse generator;
- and
- a first inverter circuit operational to generate a switching signal to the first lower switch in response to the first input signal, wherein a supply current associated with the first inverter circuit is processed by the first current pulse generator to provide a high current pulse to the first upper switch to accelerate a write current transition associated with the first upper switch.
1 more element
A write current driver circuit comprising:
- an H-switch driver having first and second upper switches and further having first and second lower switches, wherein the H-switch driver is operational to direct write current in opposite directions through a write head connected between a first node connecting the first upper switch to the first lower switch and a second node connecting the second upper switch to the second lower switch in response to first and second input signals;
- means for generating a first current pulse;
- and
- means for generating a switching signal to the first lower switch in response to the first input signal, wherein a supply current associated with the means for generating a switching signal to the first lower switch is processed by the means for generating a first current pulse to provide a high current pulse to the first upper switch to accelerate a write current transition associated with the first upper switch.
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A method of accelerating write current transitions associated with the upper switches of a magnetic recording head H-switch driver comprising the steps of:
- providing a write current driver having an H-switch, first and second current pulse generators, and first and second inverters;
- generating a switching signal via the first inverter to a first lower switch associated with the H-switch in response to a first input signal;
- and
- processing a supply current associated with the first inverter via the first current pulse generator to provide a high current pulse to a first upper switch associated with the H-switch to accelerate a write current transition associated with the first upper switch.
1 more element
Dependencies are inferred from the claim text.