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<p>LAMSIM Enterprises Inc. | By Bert Simonovich | October 29, 2020</p>
<p>Signal and power integrity (SI/PI) simulations, measurements and analysis usually live in two different worlds, but occasionally these worlds collide. One such collision occurs when we refer to characteristic impedance, Z0. Traditionally the PI world lives in the frequency domain while the SI world lives in the time domain.</p>
<p>When designing a power distribution network (PDN) in the PI world, we are mostly interested in engineering a flat impedance below a target impedance from DC to the highest frequency components of the transient current. Practically this is achieved with a network of capacitors with different values connected to the respective power planes. <a href="https://lamsimenterprises.com/Characteristc%20Impedance-%20Where%20SI-PI%20Worlds%20Collide.pdf" target="_blank" rel="noopener noreferrer" title="Characteristic Impedance Where SI/PI Worlds Collide">More...</a></p>