Circuit to Control the Time Rate of Change of Current at the Output Node of an Off-Chip Driver
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
The object of the invention is to control the time rate of change of current passing through the active device in the output stage of an FET off-chip driver circuit, while maintaining the maximum current conducting capability of the active device. The figure shows the off-chip driver (OCD) circuit which has five inverter stages feeding into an output totem pole circuit 25. A first stage, consisting of the FET devices 1 and 2, and a second stage, consisting of the FET devices 19 and 20, have their respective active device gates connected to the input node which receives signals from the internal circuitry on a VLSI chip. The output node of the first stage is applied to the load devices 5 and 5D of the gate control circuit 15.