IBIS Ground Clamp IV Curve

Ground Clamp IV Curve

By Timothy Coyle

How to Generate the Ground Clamp IV Curve

Remember that either an input or an output buffer can have an ESD structure that is represented by the clamp IV curves.

The Ground Clamp IV Curve Sweep

The Ground Clamp IV curve represents the current of the ESD structure below ground. For a tri-state output buffer the output is tri-stated, the input is set to logic low, and a DC voltage source is placed on the output. For an input buffer a DC voltage source is placed on the input. The voltage is varied from –Vcc to Vcc and the current is measured. The data is then compiled into the IBIS IV (current-voltage) table.

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