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Burn-in & Test Socket Workshop - BiTS Workshop

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Understand BIB PD<br />

Instant Supply<br />

PS<br />

Bulk<br />

Local<br />

<strong>Socket</strong><br />

Short Cold Shower<br />

Die<br />

Cold For A While<br />

– When the die consumes a large current <strong>in</strong> a very short<br />

period dur<strong>in</strong>g the output state transition, it will cause<br />

unwanted voltage drop(spikes/transient) along the<br />

power path.<br />

– Thus, the decoupl<strong>in</strong>g capacitors(bulk/local) are placed<br />

near to the die to lower the ground bounce/transient<br />

noise on the power supply(PS) for the device.<br />

• They will charge up dur<strong>in</strong>g the less stressful period and then<br />

provide additional charges dur<strong>in</strong>g the transient <strong>in</strong>stead of the<br />

PS, thus reduc<strong>in</strong>g the spike magnitude along the power path.<br />

02/01/2002 <strong>BiTS</strong> 2002 3

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