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If you have designed a controlled impedance transmission line based on a PCB stack-up, how do you know if the PCB fabrication house or another vendor built your stack-up to meet your controlled impedance specification?

I do not know if there was a legitimate reason for this request, but I was once asked to determine the turns ratio of a power transformer inside a sealed, DC-DC converter module.  In any case, there is not much usable information since the module is sealed, but we can apply a simple trick. Check out this latest installment in Extreme Measurements.

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As rated by reader views, here are the Top 5, Most Read Articles on SIJ of all time. Thank you for your continued readership, as we look forward to bringing you many more great technical features in 2022 and beyond!

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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…

In this Extreme Measurement Example, see how measurements were used to resolve the shield resistance issue, where the authors redesigned the PCB to clear the DUT contact, but also identified alternate solutions in the event they could not wait for a new PCB.

This first post in a new blog series, Extreme Measurements, introduces how an extreme measurement is defined. Find out how your extreme measurement story can end up on SIJ!

In this tongue-in-cheek experiment that leads to actionable conclusions, Ben Dannan and Steve Sandler set out to discover a method to mitigate the lack of an isolation calibration step on a VNA.

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.