Impedance matched, voltage-mode H-bridge write drivers

Details Impedance matched, voltage-mode H-bridge write drivers Impedance matched, voltage-mode H-bridge write drivers

1998-09-14

2000-09-19

Zweizig, Jeffrey

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327423, H03B 100

Patent

active

061218006

ABSTRACT:
A write driver for an inductive load includes load terminals for connection to an inductive load, and a driver circuit responsive to first and second control signals to supply a drive current through the load in respective first and second directions. A voltage-mode H-bridge connected to the load terminals is operable to selectively supply a voltage across the load terminals and head. Program means operates the voltage-mode H-bridge for a predetermined time period following initiation of the respective first and second control signal to provide a voltage across the load terminals which quickly raises the write current to a steady state condition. Ringing is suppressed by employing an impedance-matched H-bridge for the driver circuit, the impedance-matched H-bridge having an impedance matched to the impedance of a transmission line connecting the load to the terminals.

REFERENCES:
patent: 5126603 (1992-06-01), Hattori
patent: 5379209 (1995-01-01), Goff
patent: 5550502 (1996-08-01), Aranovsky

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