I knew something about electronics thirty years ago, but I've forgotten everything I once knew. Re-learning at my age is going slow. I think I'm vaguely understanding this but I'm not sure.
You protect an output the same way that you protect an input. Add series impedance to limit the current and shunt protection.
[snip]
For protection against ESD, a shunt capacitor and shunt diodes may be sufficient.
As I understand it, for proper, official ESD protection a series impedance is necessary.
With a voltage reference the series impedance, usually a resistor, will introduce error. For example, a 470 Ohm resistive series impedance and a voltmeter with a 1 megohm input impedance would introduce an error of about 470 parts per million. With a 10 megohm voltmeter impedance the error would be about 47 parts per million. Which is not good for a precision voltage reference.
I figured, and Mr. Hess seems to be saying, that shunt protection without a series impedance is better than nothing and might protect a device from a low energy ESD event. Any series impedance you can fit in within your error budget would would be even better.
Am I understanding this correctly?
Would a series inductance help with ESD protection? A ferrite bead or two, or a larger inductance?
I'm going to build some sort of semi-precision voltage reference that I'll have to carry around and find someone or someplace to measure the voltage precisely. I'd like as robust ESD protection as possible but am not sure how to go about it.
Brak