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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Cres Effect <strong>in</strong> Optimization<br />
Z (Ω)<br />
Ztarget<br />
ESRreq<br />
Note: impedance response is not drawn to<br />
actual technical performance<br />
Before optimization<br />
Cres<br />
Cres<br />
Normal optimization without <strong>Socket</strong>+Pkg: It<br />
doesn’t consider the Cres major contribution.<br />
Hence, the decoupl<strong>in</strong>g optimization will have<br />
Z at this freq above the Ztarget and it needs a<br />
2 nd optimization for Zsystem< Ztarget.<br />
Right optimization: It does consider Cres effect.<br />
Thus, the decoupl<strong>in</strong>g optimization that will have<br />
impedance at this freq meets the Ztarget.<br />
1 1K 1M 1G<br />
Frequency(Hz)<br />
– Hence, for 1-time optimization <strong>in</strong>stead of twice, it needs<br />
to consider the highest resistive element, ie the socket<br />
Cres effect s<strong>in</strong>ce it <strong>in</strong>creases the Zsystem.<br />
– Use Cres effect as reference for estimat<strong>in</strong>g capacitor<br />
quantity by reduc<strong>in</strong>g Ztarget by Cres to give the<br />
required ESR for each cap type.<br />
– By hav<strong>in</strong>g total cap ESR of a cap type(all parallel)<br />
meet<strong>in</strong>g ESRreq(cap optimization) will br<strong>in</strong>g Zsystem to<br />
02/01/2002 below
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