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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
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
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