~ Curve Tracing ~

Figure on left is the Curve Trace probing station.

Figure on right is the Curve Trace graph viewer.

OKOK. whats next?? CURVE TRACE IS UP NEXT. After finish doing cross section, I proceed with part II of my project. I continued with Curve Tracing. This is to probe the unit sample pin to pin curve tracing to obtain the I-V curve characteristic.

I have to do curve trace on good unit samples and also units which has undergo stress. After that, I will compare the stress unit’s graph to the good unit’s graph to determine which pin has failure.

With such a small unit… 1.0mm x 1.5mm… on the unit, there are 6 solder bumps. This unit call WLCSP, does not use wire bonding for connection instead it uses solder bump to connect to external circuitries. So, I will have to probe pin 1,2,3,5 and 6 with respect to GND and save the graph obtain. TINY TINY little solder bumps on the unit, FINE FINE little probing needles… My eyes see stars…. Again, patience...

But once I get the catch of it.. I am on track… Interesting task.. but I am stil looking forward to understand those characteristics of the graphs for each pin to pin… When is it early breakdown… when is it leakage current.. when it is normal… Hmm..