Impedance-matched, voltage-mode H-bridge write drivers
AssigneeAgere Systems Guardian Corp.
InventorsJohn D. Leighton, Eric Groen
Life of this patent
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Abstract
A write driver for an inductive load includes load terminals for connection to an inductive load, and an impedance-matched driver circuit responsive to first and second control signals to supply a drive current through the load in respective first and second directions. The inductive load includes an inductive write head and a transmission line of predetermined impedance connected to the write head for connection to the first and second load terminals. Ringing is suppressed by the impedance-matching of the driver circuit to the transmission line connecting the load to the terminals.
Claims3
A write driver for an inductive load comprising:
- first and second load terminals for connection to an inductive load, the inductive load including an inductive write head and a transmission line of predetermined impedance connected to the write head for connection to the first and second load terminals;
- an impedance-matched driver connected to the first and second load terminals and responsive to a first control signal to supply a drive current through the load from the first load terminal to the second load terminal and responsive to a second control signal to supply the drive current through the load from the second load terminal to the first load terminal, the driver having an impedance matched to the impedance of the transmission line.
Dependencies are inferred from the claim text.