Power Integrity

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This paper, presented at EDI CON USA 2017, demonstrates the use of a special probe tip utilized to convert a differential measurement of inductor voltage to a measurement of inductor current. It shows the connection and calibration considerations in the measurement of inductor current, including the digital signal processing algorithms required to compensate for the components in the power supply and the probe tip. It also explains current sharing measurements made in the time and frequency domain using a transient current generator.

Microwave engineers know that sharp corners and right-angle bends have their drawback at high frequencies. So what happens if we go to the other extreme of the spectrum, to DC? Istvan Novak takes a closer look.

Measuring sub-milliOhms is difficult.  Getting low noise, sub-milliOhm measurements in very small circuits is a bit more difficult.  We recently had the opportunity to support R&D Altanova in performing this difficult measurement, here are some of the results.

If you want help measuring things, there’s no cheaper way to do it than this!

Read Eric’s suggestions on measured voltage noise and download a free sample of Eric and Larry’s new PDN Design book.

Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LTC7820, a high-power fixed ratio charge pump DC/DC controller that eliminates the power inductor in a non-isolated intermediate bus converter, allowing up to a 50 percent reduction in circuit size and up to 4000 W/in³ power density.

We have to use enough capacitors so that the PDN functions properly. At the same time, to keep cost and size in check, we want to avoid overdesign and not use capacitors unnecessarily. Read on for advice on how to find the balance.