Base drive boost circuit for improved fall time in bipolar trans

Details Base drive boost circuit for improved fall time in bipolar trans Base drive boost circuit for improved fall time in bipolar trans

1976-12-30

1978-03-28

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307280, 307300, 330262, H03K 329, H03K 1908

Patent

active

040816958

ABSTRACT:
An improved fall time is achieved in bipolar transistor logic circuits which have three-state outputs. The circuits comprise a logic input terminal which is coupled to a push-pull output stage to drive a three-state output terminal. A three-state input receives three-state control signals for holding the output transistors in their non-conducting, high impedance state. Improved speed is achieved by adding a feedback circuit to remove stored base charge from the upper output driver transistor and to supply base current derived from the load to the lower output driver transistor during high to low transitions of the output voltage.

REFERENCES:
patent: 3181004 (1965-04-01), Guckel
patent: 3213294 (1965-10-01), Okuda
patent: 3978347 (1976-08-01), Hollstein et al.
patent: 4042840 (1977-08-01), Chan

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