Write driver with buffer circuits between pull-up resistors and

Details Write driver with buffer circuits between pull-up resistors and Write driver with buffer circuits between pull-up resistors and

1997-07-30

1999-04-13

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327423, 327482, 327483, 327489, H03K 300

Patent

active

058942378

ABSTRACT:
A write driver, having a pair of head pins for connection to a write head, includes two push-pull buffer circuits connected respectively between first and second pull-up resistors and the control nodes of first and second upper drive transistors. The buffer circuits selectively charge and discharge the inherent capacitances of the upper drive transistors, thereby accelerating their turn on and turn off without diminishing head swing. Moreover, connecting the buffer circuits between the pull-up resistors and the upper transistors effectively isolates, or buffers, the pull-up resistors from the self-inductance voltages of the write head, reducing glitching in the write-head output signal.

REFERENCES:
patent: 4841166 (1989-06-01), Harnden
patent: 5296975 (1994-03-01), Contreras et al.
patent: 5532631 (1996-07-01), Ngo et al.
patent: 5550502 (1996-08-01), Aranovsky
patent: 5757215 (1998-05-01), Schuelke et al.

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