Current mirror based write driver

Details Current mirror based write driver Current mirror based write driver

1993-06-18

1995-01-31

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 67, 360 46, G11B 509, G11B 502

Patent

active

053863283

ABSTRACT:
A write driver to operate inductive heads for magnetic recording is disclosed. The inductive recording head is coupled between first and second outputs of a first write driver block. The first and second outputs of the first write driver block are coupled to first and second inputs of a second write driver block, respectively. First and second current sources are coupled to third and fourth inputs of the second write driver block, respectively. A first switching block is coupled to the first current source and to the third input of the second write driver block. A second switching block is coupled to the second current source and to the fourth input of the second write driver block. A first input signal is provided to a first input of the first write driver block and to the first switching block. A second input signal is provided to a second input of the first write driver block and to the second switching block. The second output of the first write driver block, the inductive recording head and the first input of the second write driver block form a first current path when the first input signal is greater than the second input signal. Conversely, the first output of the first write driver block, the inductive recording head and the second input of the second write driver block form a second current path when the second input signal is greater. The first and second input signals may be CMOS or differential ECL signals.

REFERENCES:
patent: 4639794 (1987-01-01), Ferrier
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patent: 4956720 (1990-09-01), Tomisawa
patent: 5121369 (1992-06-01), Makansi
patent: 5132852 (1992-07-01), Price, Jr.
patent: 5168395 (1992-12-01), Klaassen et al.
patent: 5257146 (1993-10-01), Price, Jr.
patent: 5287231 (1994-02-01), Shier et al.
patent: 5291347 (1994-03-01), Ngo et al.

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