Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1991-09-18
1992-11-24
Howell, Janice A.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307315, 307570, 307300, H03K 326, H03K 1760
Patent
active
051665441
ABSTRACT:
A driver circuit provides a high output current at a fast slew rate to a low impedance load. The driver circuit has an output circuit including a first bipolar transistor having a collector emitter path between a voltage supply line and a node for connection to a load. The output circuit also includes a first FET having its source-drain path connected between the voltage supply line and the base of the bipolar transistor, and its gate connected to an input node. An additional circuit supplies drive current to the base of the first bipolar transistor only to assist the first bipolar transistor turn-on, so that the additional circuit does not add extra voltage drop across the first bipolar transistor during turned on operation. In one embodiment, the first and second bipolar transistors are NPN transistors, and the first and second FETs are p-channel FET devices.
REFERENCES:
patent: Re33378 (1990-10-01), Mehl
patent: 4590395 (1986-05-01), O'Connor et al.
patent: 4885486 (1989-12-01), Shekhawat et al.
patent: 5045734 (1991-09-01), Mehl
Bachand Richard A.
Howell Janice A.
Jorgenson Lisa K.
Phan Trong
Robinson Richard K.
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