Power Integrity

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A Bode Plot Without Access to the Control Loop

This extreme measurement seems more impossible than difficult.  The traditional stability assessment method for voltage regulators is the Bode plot.  Access to the control loop is required and a small signal is injected into the control loop, usually via a resistor, placed at the top of the voltage sense divider. Without access to this voltage divider, there isn’t a place to inject a signal into the control loop, and therefore the Bode plot is seemingly impossible…


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Selecting a VRM Output Inductor

A consideration that is often neglected is the impact of the self-resonant frequency (SRF) or parallel equivalent capacitance, Cp, which is related to SRF. In this article, Steve Sandler focuses on the impact of the inductor SRF on switching regulator performance.


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Why You Need to Care About Both S and Z Parameters for PDN

I often get questions from my fellow design engineers from around the world asking why we should or should not use S parameters or Z parameters for power distribution network (PDN) designs or validation.  The truth is, we should be familiar with both, because depending on our design and validation tools, one or the other may be better suited for the task. Read on to find out why.


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Home Labs of the Stars

While many already had home lab setups for projects and exploring curiosities, the challenges of the global pandemic have driven many to ramp up their set ups and spend more time at their in-house benches. Over the years, Signal Integrity Journal has worked with many leading industry experts and stars in our field. Some have gamely agreed to play along with me and share images of their home labs. Enjoy the tour!


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