Driver circuit with pull down npn transistor and gain reduction

Details Driver circuit with pull down npn transistor and gain reduction Driver circuit with pull down npn transistor and gain reduction

1997-05-08

2000-06-06

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327478, 327384, 326 89, 330262, H03F 326

Patent

active

060723416

ABSTRACT:
A driver circuit with pull down npn transistor drives an output voltage signal in response to an input voltage signal, without high-speed pnp transistors. A first npn transistor provides current to the output node when the output node is at a level equal to and less than the level of the input voltage signal less a base-to-emitter junction drop across the first npn transistor. A second npn transistor sinks current from the output node when the output node is at a level greater than the level of the input voltage signal less the base-to-emitter junction drop across the first npn transistor. The second npn transistor is controlled by a level of a control node. When the level of the output node is greater than the level of the input voltage signal less the base-to-emitter junction drop, the first npn transistor is turned off and the level of the control node is charged up by a current source. When the level of the control node reaches a sufficient level, the second npn transistor is turned on and the level of the output voltage signal is decreased.

REFERENCES:
patent: 4300103 (1981-11-01), Van De Plassche
patent: 4573021 (1986-02-01), Widlar
patent: 4803442 (1989-02-01), Hogg
patent: 5216296 (1993-06-01), Tsunoi et al.
patent: 5343092 (1994-08-01), Dhong et al.
patent: 5420532 (1995-05-01), Teggatz et al.
patent: 5610538 (1997-03-01), Kim
patent: 5654648 (1997-08-01), Medhekar et al.

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