Frequently Asked Questions about PESTO℠

System Designer Q's

The Part Number I want to try in my system isn't listed.

We are evaluating and expanding the library all the time. Contact us and see if we may already have the data for the device you need.

I am a system designer, and the [insert parameter here] performance is not what we have observed.

The simulation engine is blindly computing the interactions of the models it has been given. Do the models match the device revisions being used? Compare simulations of the devices separately and see if the DUT or the DUP vary more than the other. Actual silicon revisions within wafer lots may vary tremendously, yet still meet manufacturer specification. Sometimes critical parameters which affect robustness (such as dynamic resistance, etc.) may not be bounded by a manufacturer's specification at all.

The PESTO℠ simulation predicted our system would pass at 6kV, but it passes 7kV with one gun, and fails at 5kV with another gun

The IEC61000-4-2 spec allows for a wide envelope for "calibrated" ESD guns. This means that gun testing results may vary dramatically. Accordingly, you may choose to guard-band your simulation with a slightly higher stress level to account for "hotter" guns, or conversely, to use a lower stress level to bracket best-case operation to bound the uncertainty.

I found a part with PESTO℠ and the system passes 30kV! But that part is 100pF and won't work with [insert high speed interface port here!]

Contact us for additional offline services which can help you narrow your search and analysis. We can generate reports against other cost and performance constraints you supply.



ASIC Designer / IC Supplier / Device Under Protection Q's

I am a component manufacturer, and the [insert parameter here] performance predicted here is not what we specify.

Some of our models are created from manufacturer datasheets. Other models are created from data provided from the manufacturer. Some models are from Pragma Design measurements of a typical sample device. The data sources are denoted in the model names and report descriptions. Manufacturer datasheets usually include guard-bands, or worst case "sand-bagged" safety margins. Care must be taken to understand the hybrid simulation for the parts that comprise the whole, just as a prototype under test may not represent all corner cases.

I want people to try our chip in their system, but isn't listed.

We are evaluating and expanding the library all the time. Contact us about how to get a new part listed in the library.

I have a new component which is unreleased. Can you create a confidential model?

Yes. The model can be open to anyone, or restricted to your account only. You can also make a special access code for it for your customers to access it. Contact us for more details.

The PESTO℠ simulation makes our part look very robust! Maybe we should charge more!

You and your customers and Adam Smith have to figure that out.

The PESTO℠ simulation makes our part look weak! It's good enough for the application!

To borrow from Billy Joel, you may be right. We may be crazy. But this just might be the simulation your customers were looking for.



TVS Designer / Protection Device Supplier / Device Under Test Q's

I want people to try our chip in their system, but isn't listed.

We are evaluating and expanding the library all the time. Contact us about how to get a new part listed in the library.

I have a new component which is unreleased. Can you create a confidential model?

Yes. The model can be open to anyone, or restricted to your account only. You can also make a special access code for it for your customers to access it. Contact us for more details.

The PESTO℠ simulation helped us get a design win for our chip at a key system designer! Thanks!

You are responsible for your own success stories. We're only here to help shed some light on that path.

The PESTO℠ simulation helped our competitors get a design win for their chip at a key system designer! Not fair!

You are responsible for your own success stories. We're only here to help shed some light on that path.



General Simulation Q's

The PESTO℠ simulation looks very much like our measurements, but the initial peak voltages are much higher than we actually measure.

Keep in mind that the simulated voltage and current probes have essentially infinite bandwidth and zero loading. Your probing techniques necessarily must have some bandwidth limitation and loading of the circuit.

There's a bunch of "noise" or "ringing" in the simulation. How do I filter that out?

It may mean something. Keep in mind that once ESD clamps spring into action they may present very low impedances to a previously well-matched PCB trace. Ringing may be indicative of energy bouncing back and forth without being dissipated.

There's a bunch of "noise" or "ringing" in our measurement. How do I filter that out?

It may mean something. See if you can adjust the parameters of the PCB model to more closely match your observations. Also remember that the IEC61000-4-2 guns create large EMI fields during the pulse and that energy can show up as anomalous readings.

Cool, but I've got 1E+006 other things going on and don't have the time/inclination/bandwidth/resources to mess with this. Can't you just tell me which parts will work?

Indeed we can. Contact us and let's discuss the goals and limits of your system. We can detail a complete report on the available options.

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