AEi Systems
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Los Angeles, CA 90045

In the last newsletter, we introduced a Video Series on Power Integrity. We hoped you enjoyed it. This month we added several new videos on time domain measurement.

Series Overview: Power Distribution Network, or PDN, is a hot topic that is of great concern to power supply and digital designers alike.

Check out the vidoes and articles here. AEi Systems specializes in PDN assessments for the linear and switching regulators driving your FPGAs and ASICs. If you have any questions or need any analysis support, please contact us.

Non-Invasively Assess Your Multiple-Loop LDO’s Stability
Some LDOs use multiple feedback loops to improve transient response. Some or all of the loops are inside the IC making Bode plots unusable in determing stability. There is another method avialable.

Five Things Every Engineer Should Know About Bode Plots
Bode plots are useful for the assessment of control loops. However, they do not always give an accurate representation of stability. This article presents an excellent case study on the pitfalls, as well as a simpler alternative.

Measure small impedances with Rogowski current probes
A Rogowski current probe, which can be used to measure the input and output impedance of a power supply, has many advantages over other types of current probes.

Circuit designers, particularly power supply designers, are frequently required to measure power supply ripple. Nevertheless, many engineers struggle with this measurement as sensitivity, selectivity, and bandwidth limitations degrade the accuracy of oscilloscope results. But as Steve Sandler explains in this 7-minute video, specialized probes and adapters can improve the results obtained from the conventional time-domain approach to measuring ripple, while other approaches to measuring ripple in the spectrum and impedance domains can yield more accurate and more insightful results.

Part 8: Making Time Domain Measurements
In previous videos, Sandler discussed measurement of power supply signals such a switch-node waveforms and output ripple. In this video, he delves further into time-domain measurements of power supply signals using oscilloscopes, sometimes in combination with specialized adapters such as current injectors. He presents examples of various waveform anomalies and discusses techniques and tips for observing them as well as pitfalls to avoid. Sandler also advises designers on minimum and recommended specifications for oscilloscopes in order to be able to catch the types of waveform anomalies discussed here.

Part 1: Why Stability Matters
Part 2: Impedance is the Critical Measurement
Part 3: Measuring Impedance Using Vector Network Analyzers
Part 4: Measuring Impedance Using Vector Network Analyzers (Two-Port Tests)
Part 5: Using Current Injectors
Part 6: The Switch

Cheaper than in-house resources

Faster than in-house resources - ready to go

How can we help you? Contact us for more specific information or a no-obligation quotation.