Presented By: Steve Sandler, Founder and CEO of Picotest Duration: 54 minutes (available on demand) Sponsored by: Rohde & Schwarz Register now to watch on demand Abstract: Modern instruments are available to perform almost any measurement with extreme accuracy and resolution. Despite this, there has been a trend to include more capabilities within the most common of benchtop instruments, the oscilloscope. In past years, oscilloscopes have added basic additional features, su

Title: Characterizing the VRM Duration: 30 minutes (Available On Demand) Presented by: Steve Sandler, Founder, Picotest Abstract: A high fidelity VRM model is required to properly assess system performance, and this includes power integrity (PI). This has always been my position and I have presented papers, videos and lectures on the topic. Most recently I wrote an article, published in the July 2019 Signal Integrity Journal, illustrating the interactions between the VRM and

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Measuring the negative resistance of a DC-DC converter’s input requires introducing a perturbation of the input voltage while measuring the input voltage and the input current. Using a frequency response analyzer (FRA) or vector network analyzer (VNA), the modulated voltage divided by the resulting modulated current provides a direct measurement of input impedance. The Picotest J2121A line injector simplifies this measurement by integrating a modulator and a hall current moni

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PROVEN TECHNIQUES FOR GENERATING HIGH-FIDELITY MEASUREMENTS Power Integrity: Measuring, Optimizing, and Troubleshooting Power Related Parameters in Electronics Systemsprovides field-tested techniques for producing high-fidelity measurements using the appropriate equipment. The book thoroughly discusses measurement guidelines, test instrument selection and use, connecting the equipment to the device being tested, and interpreting the acquired data. The latest electronics techn

The voltage regulator module (VRM) is at the foundation of power integrity, making proper selection essential. There are thousands of VRMs and VRM controllers available from many manufacturers. They 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. Even after the VRM o

What is a sensitive circuit? Sensitive circuits are those that can easily be degraded by power supply noise.  These circuits generally include oscillators, LNAs, transceivers, mixers and ADCs. I’ll probably receive emails from many readers adding to my list, and justifiably so, so take these as a few examples and not a comprehensive list. Click here to read the entire article. #noise #articles #j2120a #psrr #powersupply #impedance

Original air date: March 15, 2017 Why this Webcast is Important: Whether your power supply designs are based on switch mode or linear technology, there are many reasons why you should characterize the frequency response of your power supply designs. Two reasons are to better to understand the stability and noise immunity under various load change conditions based on an existing design. Another good reason is to gain the missing information required to create or improve a simu

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Although not quite as accurate as the two-port VNA impedance measurement, the current injection technique has advantages including wide range (approx. 1 milli-ohm to thousands of ohms), the ability to measure in-system, and a suitability for measuring low-power devices such as op amps, voltage references and voltage regulators. In addition, current injectors can be used to carry out other types of tests such as non-invasively measuring PSRR, determining power integrity and si

One characteristic of Op Amps that limits the performance of low noise and precision circuits is PSRR. The output of the Op Amp is not only a function of the inputs, but also of the power supply. The PSRR of Op Amps is a frequency dependent function, so that the higher the signal frequency, the lower the PSRR is. In general, the manufacturers provide high fidelity data for PSRR, which might lead to the question of why we should measure it. There are several reasons that we sh

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