The 5-Minute Method for Stabilizing Any Control Loop
By Steve Sandler | January 28, 2020 One method of designing stable control loops is to create an accurate broadband simulation model and...
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Picotest
- Jun 20, 2017
- 1 min
Introduction to NISM – Non-Invasive Stability Measurement with Steve Sandler
More information on this revolutionary measurement technology can be found here: https://www.picotest.com/non-invasive-stability-measurem...
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Picotest
- Nov 29, 2016
- 1 min
Introduction to Power Integrity – Video
Steve Sandler of Picotest and Heidi Barnes of Keysight teach this short course on Power Integrity. This is part 1 (~90 min) as presented...
15 views0 comments
Picotest
- Jan 12, 2015
- 2 min
Impedance measurements stabilize op-amp buffers
Figure 1. Op amps are often used as unity gain signal buffers, which are not as simple to use as it may appear. The unity-gain op amp...
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Picotest
- Nov 14, 2014
- 1 min
Essential 1-Port PDN PROBE: Applications Abound
BROWSER-CLASS PROBE Several companies manufacture and distribute high-frequency TDR probes. These probes are typically designed for very...
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Picotest
- Oct 30, 2014
- 1 min
Paultre on Power – Steve Sandler of Picotest on power test and noise (Podcast)
October 31, 2014 In this podcast Steve Sandler of Picotest talks to Alix Paultre of Power Systems Design on the issues of power test,...
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Picotest
- Jul 1, 2014
- 2 min
Three Stability Assessment Methods Every Engineer Should Know About
Many engineers are familiar with the Bode plot as an effective stability assessment method. However, some authors suggest and even teach...
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Picotest
- Apr 23, 2014
- 1 min
Software Enables Accurate Stability Test, Improves Non-Invasive Phase Margin Measurement Accuracy
The mathematics behind the non-invasive measurement was incorporated into the OMICRON Lab Bode 100 VNA software, sold by Picotest.com,...
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Picotest
- Jan 22, 2014
- 2 min
Five Things Every Engineer Should Know About Bode Plots
In 1938 Hendrik Wade Bode, who worked at Bell Labs, published his asymptotic assessment of phase margin and gain margin, bearing his name...
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Picotest
- Jan 6, 2014
- 1 min
Non-Invasively Assess Your Multiple-Loop LDO’s Stability
Some low-dropout regulators (LDOs) use multiple feedback loops to improve output voltage transient response. In many of these cases, some...
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Picotest
- Nov 7, 2013
- 2 min
Combination VNA/FRAs Offer More Capability And Lower Cost
A frequency response analyzer (‘FRA’) is often used to measure gain and phase plots of control loops (Bode plots), filter responses and...
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Picotest
- Oct 30, 2013
- 2 min
How To Verify Control Loop Design
The non-invasive stability assessment is a method that uses an output impedance measurement to accurately determine stability without...
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Picotest
- Oct 7, 2013
- 1 min
Troubleshooting Distributed Power Systems: Using Current Injectors (Part 5 of the ongoing video seri
Although not quite as accurate as the two-port VNA impedance measurement, the current injection technique has advantages including wide...
6 views0 comments
Picotest
- Aug 27, 2013
- 1 min
How to Solve 8 of 10 Design Issues
The vast majority of design issues are directly or indirectly attributable to control loop stability. The most common offenders: Linear...
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Picotest
- Jun 11, 2013
- 1 min
Troubleshooting Distributed Power Systems: Impedance Is the Critical Measurement (Part 2 of the ongo
As Sandler explains, analysis based on impedance measurements can more thoroughly assess control loop stability than Bode plot...
3 views0 comments
Picotest
- May 15, 2013
- 1 min
Troubleshooting Distributed Power Systems: Why Stability Matters (Part 1 of the ongoing video series
In this 5-minute video presentation, Steve Sandler discusses how stability impacts circuit performance, offering examples that...
4 views0 comments
Picotest
- Sep 28, 2012
- 1 min
Assessing Point-Of-Load Regulators Using Non-Invasive Techniques
Evaluating the stability of a Point-Of-Load (“POL”) regulator can be performed using both traditional Bode plot and output impedance...
15 views0 comments
Picotest
- Sep 27, 2012
- 1 min
FAQ #22: So how does this non-invasive measurement relate to phase margin and gain margin?
We can equate the stability to an equivalent phase margin by assuming the magnitude of the gain vector to be 1 and solving for the Q. In...
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Picotest
- Sep 18, 2012
- 2 min
FAQ #21: How do you use the Picotest injectors and the Agilent analyzer to measure output impedance
How do you use the Picotest injectors and the Agilent analyzer to measure output impedance and/or non-invasive step loading? For the...
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Picotest
- Aug 20, 2012
- 2 min
Exploring Bandwidth, Gain Margin and Phase Margin in Non-Invasive Measurement
Summary Among the most frequently asked questions regarding non-invasive stability measurement are “How do I determine the bandwidth,...
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