Method and apparatus for a load adaptive pad driver

Details Method and apparatus for a load adaptive pad driver Method and apparatus for a load adaptive pad driver

1995-04-05

1997-01-28

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327379, 326 83, H03K 17687, H03K 301

Patent

active

055981194

ABSTRACT:
A load adaptive pad driver for integrated circuits provides a substantially constant speed output at the pad regardless of the load connected to the pad. A reference slope signal, based on variables such as fabrication process, and operational voltage and temperature ranges and biased to give a substantially flat response, is compared to the signal output of a resistive-based pad driver circuit. When a transition between output signal levels provided by the pad driver circuit is slower than the reference signal slope, an auxiliary driver circuit is used to compensate. Electromagnetic interference is also reduced via said load adaptive pad driver.

REFERENCES:
patent: 4567378 (1986-01-01), Raver
patent: 4825099 (1989-04-01), Barton
patent: 4906867 (1990-03-01), Petty
patent: 5039874 (1991-08-01), Anderson
patent: 5140591 (1992-08-01), Palara et al.
patent: 5166558 (1992-11-01), Ohsawa
patent: 5237213 (1993-08-01), Tanoi
patent: 5300830 (1994-04-01), Hawes

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