IBIS Power Clamp IV Curve

Power Clamp IV Curve

By Timothy Coyle

How to Generate the Power Clamp IV Curve

The Power Clamp IV curve table data is like the Pullup IV curve table data in that it has to be formatted to be Vcc relative according to the IBIS specification. (We’ll talk about this in a later article)

The Power Clamp IV Curve Sweep

The Power Clamp IV curve represents the current of the ESD structure above Vcc. For a tri-state output buffer the output is tri-stated, the input is set to logic high, 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 2*Vcc and the current is measured. The data is then compiled into the IBIS IV (current-voltage) table.

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