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HBM for ESD test

B

beni

Jan 1, 1970
0
Hi,

I was wondering if anyone can help me with this. I'm looking for a
circuit-block (SPICE model) that generates a current pulse (according to HBM
Standard S5.1) that can be connected to one of the inputs of a chip so that
I can simulate the behaviour of the ESD protection circuitry. I know what
there should be a cap, resistor, risetime of 2-10ns and pulse width of
150ns. But is that enough info for setting up the test bench? Any one has a
sample spice deck? The simulations does not have to be very accurate as long
as it gives me an idea how to set it up and indication of the behaviour of
the ESD protection.

I would really appreciate any help.

Thanks,
Janet(beni)
 
K

Killer Smurfs

Jan 1, 1970
0
beni said:
Hi,

I was wondering if anyone can help me with this. I'm looking for a
circuit-block (SPICE model) that generates a current pulse (according to HBM
Standard S5.1) that can be connected to one of the inputs of a chip so that
I can simulate the behaviour of the ESD protection circuitry. I know what
there should be a cap, resistor, risetime of 2-10ns and pulse width of
150ns. But is that enough info for setting up the test bench? Any one has a
sample spice deck? The simulations does not have to be very accurate as long
as it gives me an idea how to set it up and indication of the behaviour of
the ESD protection.

I would really appreciate any help.

Thanks,
Janet(beni)

You can time scale. you are missing items on on the source you want. What
voltage, need another resistor, and what about negitive spikes?
 
D

Dimitrios Tzortzakakis

Jan 1, 1970
0
A charged flash (photo) capacitor will do.I short-circuited once one, and
the result was an explosion.It can give you also a shock;the voltage is over
300 volts.It has a dedicated circuit, that makes ac from the battery's dc
and raises it to 300 volts, and then dc again.Pretty fascinating thing;I
wouldn't suggest though that you open an expensive photo flash unit just to
experiment.
 
C

Cecil Aswell

Jan 1, 1970
0
Quick input from an old IC designer...

ESD events are not accurately simulated in spice. You can easily come
up with a HBM source using simple spice elements but the real problem is
what happens on the chip. Most of the work that has been done in ESD
protection in "the real world" relies on lots of test structures and lab
work.

A prime example is a failure mode of NMOS devices where the device
goes into localized bipolar snapback and concentrates the energy in a
very small area. Solutions to this failure include lots of process
specific layout rules, such as contact to gate spacing, minimum junction
areas, etc.

If you are really interested is this topic there are some good texts
available. What you glean in a news group will not be terribly useful in
"the real world".

Best regards,

Cecil Aswell
(no numbers in my email address)
 
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