Write circuit having current mirrors between predriver and write

Details Write circuit having current mirrors between predriver and write Write circuit having current mirrors between predriver and write

1992-10-06

1994-02-15

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 46, G11B 502, G11B 509

Patent

active

052872319

ABSTRACT:
A write circuit for driving a magnetic head in a magnetic storage system which greatly improves the voltage swing across the magnetic head. The write circuit includes data input for receiving data input signals, a predriver current source, a predriver circuit, and a write driver circuit. The predriver circuit is connected to the data input and has first and second predriver current paths. The predriver current paths are connected to a predriver current source. The predriver circuit directs current from the predriver current source through the first and second predriver current paths as a function of the data input signals. The write driver circuit has first and second write currents paths connected across the magnetic head. The first write current path directs current through the magnetic head in a first direction and the second write current path directs current through the magnetic head in a second direction, opposite to the first direction. The predriver circuit and the write driver circuit are connected together in a current mirror configuration to mirror the predriver current from the first and second predriver currents paths into the first and second write driver currents paths, respectively.

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Microelectronics, Jacob Millman (1979), A Biasing Technique and Current Repeaters, pp. 537-540.
Analysis and Design of Analog Integrated Circuits, Paul R. Gray and Robert G. Meyer (1984), Transistor Current Sources and Active Loads, pp. 241-246.
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IBM Technical Disclosure Bulletin, J. A. Bailey, R. G. Black, Jr., and J. Lewkowics, Predriver for "H" Configured Write Driver for Magnetic Recording, vol. 23, No. 11, Apr. 1981, pp. 5167-5168.

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