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

1996-08-12

1997-12-09

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327333, 327563, H03B 100

Patent

active

056964609

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: 5333081 (1994-07-01), Mitsui
IBM Technical Disclosure Bulletin, vol. 14, No. 3, Aug. 1971, NY, pp. 966-967.

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