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, 20212 min read
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
Apr 26, 20171 min read
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, 20152 min read
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
Sep 27, 20121 min read
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, 20122 min read
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, 20122 min read
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, 20121 min read
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
Mar 1, 20121 min read
Introduction to the J2110A Solid State Injector
Introduction Most of us have experience using a wideband signal injection transformer to introduce a modulation signal into our loop...
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Picotest
Feb 27, 20121 min read
Extracting Bode Plots from Output Impedance
Many articles and application notes describe the extraction of phase margin, using a non-invasive technique that extracts the phase...
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Picotest
Feb 17, 20122 min read
Stability Assessment of Fixed Regulators
There are cases where a Bode (gain?phase) plot cannot be obtained from a control loop. For example, a three terminal regulator or hybrid...
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Picotest
Nov 26, 20101 min read
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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