A Bode Plot Without Access to the Control Loop
November 23, 2021 Steve Sandler This extreme measurement seems more impossible than difficult. The traditional stability assessment...
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Picotest
- Apr 27, 2021
- 2 min
Tektronix App Note: Measuring the Control Loop Response of a Power Supply Using an Oscilloscope
Most power supplies and regulators are designed to maintain a constant voltage over a specified current range. They are essentially...
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Picotest
- Jun 28, 2019
- 1 min
Siglent App Note: Measuring Power Supply Control Loop Response with Bode Plot II
In this application note, we will show you the basic principles for making this stability measurement and how to use these instruments to...
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Picotest
- Nov 2, 2017
- 1 min
Bode Plots are Overrated
Control loop stability is critically important. But whether your focus is on power supply design, power integrity, or mixed-signal power...
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Picotest
- Apr 26, 2017
- 1 min
Characterizing and Modeling Switch Mode Power Supplies (Mar 15)
Original air date: March 15, 2017 Why this Webcast is Important: Whether your power supply designs are based on switch mode or linear...
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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
- 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
- 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...
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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
- 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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Picotest
- May 16, 2012
- 1 min
Evaluate Feedback Stability When There’s No Test Point
Fortunately, a new technique permits non-invasive stability testing of such devices.1 Designers can evaluate stability by measuring (on...
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Picotest
- Nov 26, 2010
- 1 min
Why Network Analyzer Signal Levels Affect Measurement Results
When measuring a circuit or device with our network analyzers, engineers generally inject a signal and believe that the measured results...
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