Output buffer with improved di/dt

Details Output buffer with improved di/dt Output buffer with improved di/dt

1986-09-26

1988-07-19

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307246, 307296R, 307451, 307270, 307548, H03K 1704, H03K 1712, H03K 17284, H03K 17687

Patent

active

047587431

ABSTRACT:
An integrated circuit comprises a chip containing electric circuits in a package with leads. The chip receives power via the leads. The leads have inductance so that when there is a change in current flow (di/dt) through a lead there is a voltage which is developed between the end of the lead and the chip which can cause the chip to either malfunction or function poorly. The highest di/dt is generally caused by an output buffer that changes the logic state of its output. The typical output buffer has a pair of driver transistors that provide one of a logic high or logic low. The di/dt generated by these transistors is controlled by controlling the voltage on the gate of the transistor which is providing the particular logic state. This control reduces di/dt from that typically provided at the very beginning of a logic state transition but increases it over that typically provided immediately thereafter for the purpose of optimizing logic state transition speed for a given maximum di/dt.

REFERENCES:
patent: 3651340 (1972-03-01), Cliff
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patent: 4567378 (1986-01-01), Raver
patent: 4609834 (1986-09-01), Gal
patent: 4612466 (1986-09-01), Stewart
patent: 4622482 (1986-11-01), Ganger
patent: 4634894 (1987-01-01), Shu et al.
patent: 4638187 (1987-01-01), Boler et al.
patent: 4661928 (1987-04-01), Yasuoka

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