Open Circuit localization with SDR: a case study - eufanet
Open Circuit localization with SDR: a case study. Fulvio Infante. Intraspec Technologies. Page 2. 2. Sample inspection. SRAM module. 4 Dies. Open circuit ...
Open Circuit localization with SDR: a case study Fulvio Infante Intraspec Technologies
Sample inspection
SRAM module 4 Dies Open circuit present on several pins
2
Xray analysis
Double sided PCBs with vias connecting the four components
3
Acoustic microscopy
The sample presented a number of delaminations pointed out by SAM analysis
4
SDR case 1: DQ0
5
SDR case 1: DQ0
Delaminated via 6
SDR case 2: DQ24
7
SDR case 2: DQ24
Delaminated via
8
SDR case 3: DQ26
9
SDR case 3: DQ26
Delaminated via
10
Conclusions
SDR: an easy way of locating open circuit Very simple electrical setup Great advantage of working at ’’low’’ frequencies No need to have optical access to the defect to locate it
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Position of peaks provides fault location. Shorts or low impedances are shown by EOTPR as negative peaks. Substrate. Interposer. Si Die. B. G. A. Pa c k a g e.
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