Burn-in & Test Socket Workshop - BiTS Workshop
Burn-in & Test Socket Workshop - BiTS Workshop
Burn-in & Test Socket Workshop - BiTS Workshop
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Impedance(mΩ)<br />
4x<br />
3x<br />
2x<br />
Example: BIB Cap Optimization<br />
FD<br />
47uF@600K<br />
100uF@390K<br />
0.1uF@20M<br />
1uF@8M<br />
4.7uF@2M<br />
Low Imax before FD<br />
optimization<br />
• Total Cap quantity = 20<br />
• Cbulk=18000uF<br />
• Clocal=0uF<br />
26.546MHz<br />
Ztarget<br />
1x<br />
470uF@165K<br />
1000uF@107K<br />
Basel<strong>in</strong>e:<br />
• High Imax after TD<br />
optimization<br />
• Total Cap quantity = 77<br />
• Cbulk=18000uF<br />
• Clocal=4734uF<br />
V<br />
TD<br />
Vout<br />
3rd Droop<br />
Frequency(Hz)<br />
0<br />
1K 10K 100K 1M 10M 100M 1G 10G<br />
Low Imax after PDO (FD optimization)<br />
• Note, the cap resonance that crosses with<br />
Zsystem is 47uF and use ESRreq to determ<strong>in</strong>e<br />
its quantity<br />
• Total Cap quantity = 25<br />
• Cbulk=18000uF, Clocal=188uF<br />
2nd Droop<br />
– TD confirms PDO capacitor<br />
Vnoise spec<br />
reduction scheme.<br />
Spike<br />
Time<br />
0<br />
– PDO(FD) uses less<br />
02/01/2002 <strong>BiTS</strong> 2002 capacitor than TD. 14
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