AEi Systems
5933 W. Century Blvd. Ste 1100
Los Angeles, CA 90045
+1-702-625-0568
aeisystems.com
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
- Our full-time team of top engineers with focused backgrounds in reliability, design, WCCA, and test has all the required core competencies to perform with great efficiency.
- We have a significant number of SPICE models already made. We have Parts Variability Databases. We have Radiation Data. Even if you have in-house resources, dealing with models and tolerances can take a significant amount of time. AEi Systems puts the money and time savings in your pocket as we do not charge extra for this valuable IP
- Analysis is all we do; Keep your in-house designers doing what they do best.
Faster than in-house resources - ready to go
- Our proprietary software tools, library of proven SPICE models, and our 20 years of analytical engineering experience keep your team ahead of schedule
- No bias - We introduce "checks and balances" to your design process/SDRLs
How can we help you? Contact us for more specific information or a no-obligation quotation.