Power Integrity

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Bandwidth, Current Load and Power-Rail Measurements

How do you achieve high bandwidth in your measurements while minimizing current load on your DUT? Given that your DUT is a power rail, you really don't want to draw too much current from it., or your measurement system will distort the rail. But these two measurement criteria are at loggerheads with each other. It's a quandary, and it has to do with the fundamental nature of signals on interconnects.


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Mitigate RF Pickup In Power Rails

Measuring the noise on a power rail seems to be a straightforward task. However, there are some basic pitfalls that can cause incorrect, or even downright strange, results. Let's look at one of these challenges: RF pickup. We'll demonstrate the effect of RF pickup on a power-rail measurement, and then we'll show you an effective means of mitigating that effect.


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Overview and Comparison of Power Converter Stability Metrics

Power conversion circuits with control loop(s) are everywhere in electronic systems. We must establish stability and performance metrics for control loops and their circuits. However, generally accepted metrics may not be good enough. Is a crossover frequency with 45 degrees of phase margin and 10 dB of gain margin enough? How can we relate phase margin to peaking in the impedance profile and transient noise requirements? This article aims to answer these and other questions.


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Characterizing and Selecting the VRM

VRMs and VRM controllers are often selected based on size, efficiency, price, or a relationship with the manufacturer. This often leads to a poor VRM selection, requiring additional engineering resources, greater time to market, as well as, higher BOM costs to correct the deficiencies. In this article, we evaluate the choices, define some useful figures of merit, and provide specific selection suggestions.


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Target Impedance Limitations and Rogue Wave Assessments on PDN Performance

A common design technique for power distribution networks (PDN) is the determination of the peak distribution bus impedance that will assure that the voltage excursions on the power rail will be maintained within allowable limits, generally referred to as the target impedance. In theory, the allowable target impedance is determined by dividing the tolerable voltage excursion by the maximum change in load current.


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Teledyne e2v, pSemi and GaN Systems unveil industry’s fastest HiRel GaN power solution at Satellite 2018

GaN Power solution features GaN FET and half-bridge driver for high-reliability applications

Teledyne e2v is launching a complete GaN power solution based on technology from pSemi (formerly Peregrine Semiconductor) and GaN Systems. The solution features GaN FETs and the industry’s first rad-tolerant, half-bridge power driver for GaN high-reliability applications. The technology will be demonstrated at Satellite 2018 March 12-15 in the Teledyne Defense Electronics booth (#619).


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Transient Load Tester for Time Domain PDN Validation

Power distribution networks (PDNs) delivering power to ICs in a system need to be thoroughly designed and analyzed in order to make sure any voltage fluctuation on the rail is within the tolerance of every IC connected to that rail.  As ICs on the rail draw power, they generate a voltage fluctuation on the rail.  The PDN must have the capacity to supply enough charge such that the resulting voltage drop is less than the maximum voltage drop each IC on the rail can tolerate.  If voltage fluctuations appear outside IC tolerance limits, a slew of problems can surface such as IC damage, failure, or reduced lifespan.


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