Differential high speed inductive driver with a bidirectional cu

Details Differential high speed inductive driver with a bidirectional cu Differential high speed inductive driver with a bidirectional cu

1994-12-30

1996-08-13

Nelms, David C.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327333, 327563, 360 46, 360 67, H03K 300, H03L 500, G06G 712, G11B 509

Patent

active

055460305

ABSTRACT:
An innovative circuit for driving the write head. All of the driving transistors are NPN, and are prevented from saturation. This is achieved by shifting and scaling down the differential drive applied to the pull-up transistors, to drive the pull-down transistors with levels such that the pull-down transistors cannot reach saturation. This provides a very simple circuit in which all four of the drive transistors are NPN, and all are kept out of saturation. Moreover, the peak write current applied to the head is precisely limited.

REFERENCES:
patent: 4739194 (1988-04-01), Glasby et al.
patent: 4977378 (1990-12-01), Tero
patent: 5122692 (1992-07-01), Seki
patent: 5134309 (1992-07-01), Matsumoto et al.
patent: 5333081 (1994-07-01), Mitsui
patent: 5343163 (1994-08-01), Linder et al.
patent: 5392172 (1995-02-01), Yoshinaga et al.
patent: 5434717 (1995-07-01), Yoshinaga et al.

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