Electronic digital logic circuitry – Interface – Current driving
Patent
1994-12-12
1995-08-01
Westin, Edward P.
Electronic digital logic circuitry
Interface
Current driving
326 32, H03K 1716, H03K 190175
Patent
active
054382823
ABSTRACT:
A driver for providing binary signals from a data system to a transmission line is disclosed. The driver includes a first field-effect transistor (FET) coupled between an output node and ground for conducting current from the output node to ground. The output node is connectable to the transmission line. A first input stage conducts current from a first voltage supply to the gate of the first FET. The first input stage includes a voltage sensing amplifier for comparing a reference voltage to the voltage potential of the output node and for controlling the amount of current conducted to the gate of the first FET in response to the comparison. A second input stage conducts current from the gate of the first FET to ground. In an alternative embodiment, the driver includes a temperature compensation circuit coupled to the first and second input stages for adjusting the level of current conducted to the gate of the first FET and the level of current conducted from the gate of the first FET to compensate for variations in temperature.
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National Semiconductor Corporation
Nelson H. Donald
Pitruzzella Vince
Roseen Richard
Westin Edward P.
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