Open/Short Links request

[Roger Bourne]

Hello,

Does anyone know of any good links that explain "design of open/short
detection" of lead bonds (of IC modules)?

What would be a good search criteria for google?
I tried "open/short design detection", "fault detection design" but I
have yet to find an article which focuses on its design.

I have my own idea of how to make a open/short detection cct, but its
mostly derived from the theory section of the manual of [Exatron's
Open/Short Tester]. It is a small section.
http://www.exatron.com/products/pdf/400.pdf

Any help will be appreciated.

Regards,
-Roger

 

[Rene Tschaggelar]

Hello,

Does anyone know of any good links that explain "design of open/short
detection" of lead bonds (of IC modules)?

What would be a good search criteria for google?
I tried "open/short design detection", "fault detection design" but I
have yet to find an article which focuses on its design.

I have my own idea of how to make a open/short detection cct, but its
mostly derived from the theory section of the manual of [Exatron's
Open/Short Tester]. It is a small section.
http://www.exatron.com/products/pdf/400.pdf

Any help will be appreciated.

Once you defined what a short or open is,
then you're a giant leap further.
Then you could define maximum measurement
parameters in terms of voltage and current.

Rene

 

[Roger Bourne]

Hmmm,
A short would be an unexpected low resistance between 2 nets/lead
bonds.

But from a generic point of view, how does one built an automated cct
to detect a SHORT ? A cct that would detect shorts for more or less ANY
IC module.

Does one essentially mirror an ohmmeter's design (which is also
completly unknown to me) and measure for impedance between all possible
combination of 2 lead bonds? Impossible!

Any help will be appreciated

Regards,
-Roger

 

[Jim Thompson]

Hmmm,
A short would be an unexpected low resistance between 2 nets/lead
bonds.

But from a generic point of view, how does one built an automated cct
to detect a SHORT ? A cct that would detect shorts for more or less ANY
IC module.

Does one essentially mirror an ohmmeter's design (which is also
completly unknown to me) and measure for impedance between all possible
combination of 2 lead bonds? Impossible!

Any help will be appreciated

Regards,
-Roger

Just define (being somewhat arbitrary)...

SHORT < 10ohms

OPEN > 1K

I once designed an alarm system that way, such that a median value was
"good". A short or an open would trigger the alarm.

...Jim Thompson

 

[Rene Tschaggelar]

Hmmm,
A short would be an unexpected low resistance between 2 nets/lead
bonds.

But from a generic point of view, how does one built an automated cct
to detect a SHORT ? A cct that would detect shorts for more or less ANY
IC module.

Does one essentially mirror an ohmmeter's design (which is also
completly unknown to me) and measure for impedance between all possible
combination of 2 lead bonds? Impossible!

Any help will be appreciated

Basically yes. There are different ways however.
The blunt approach would be a voltage source with
current limit while measuring the current.
Define the voltage and the current limit
sufficiently small such that no damage occurs.

Another approach would be a sinewave of
sufficiently small frequency that generates a
very low voltage, eg 10mV, and measures the
current in a lock-in fashion across a burden
resistor with a gain of 10^4 or so.

Rene