Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1995-10-18
1997-06-10
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
327478, 327588, 360 68, 360 46, H03K 300, H02M 7162
Patent
active
056380127
ABSTRACT:
A write driver for writing write data to a magnetic disk. The write driver is provided with first and second pnp type input transistors whose bases are each supplied with a pair of complementary input signals, and first and second npn type output transistor in the form of an inverted Darlington arrangement. A first resistor element is provided between the emitter of a corresponding pnp type input transistor and the collector of a npn type output transistor, whereas a second resistor element is provided between the common collector of the first and second npn type output transistors and supply voltage. The collectors of the first and second pnp type transistor are supplied with clamp voltage. Third and fourth npn type output transistors each connected to the first and second npn type output transistors in series and subjected to complementary switching control are provided to form a bridge circuit and to drive an inductive head.
REFERENCES:
patent: 3731004 (1973-05-01), Cowpland et al.
patent: 4490655 (1984-12-01), Feldman
patent: 4639794 (1987-01-01), Ferrier
patent: 5291347 (1994-03-01), Ngo et al.
patent: 5469095 (1995-11-01), Peppiette et al.
patent: 5550502 (1996-08-01), Aranovsky
ISSCC "94 Session 17/Disk-Drive Electronics/Paper FA17.6", pp. 286-287.
Hashimoto Takashi
Hatanaka Noriaki
Hirose Tsuyoshi
Kaji Tadao
Nagaya Yuji
Hitachi , Ltd.
Hitachi Computer Engineering Co. Ltd.
Tran Toan
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