When Bode Plots Fail Us
It may come as a surprise to some that a control loop’s Bode plot does not always depict the loop stability and that the output impedance...
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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 24, 20121 min read
An Unconditionally Stable Linear Voltage Regulator
Is it possible to design an unconditionally stable linear voltage regulator? In fact, many believe that most regulator ICs are...
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Picotest
Feb 27, 20122 min read
FAQ #18: What injection resistor value should I use? Is it okay to use a little larger resistor like
What injection resistor value should I use? Is it okay to use a little larger resistor like 30 or 50 ohm instead of 5 ohm (like many app...
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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
Jan 30, 20121 min read
Are We Focused On The Wrong Reference Parameters?
Designing a reliable circuit that employs a voltage reference requires a more detailed look at device parameters than most data sheets...
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Picotest
Sep 1, 20111 min read
New Technique for Non-Invasive Testing of Regulator Stability
Output impedance is the key to testing filter and regulator phase margin, even when the control loop is inaccessible. Many voltage...
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Picotest
Aug 4, 20111 min read
A Simple Method to Determine ESR Requirements for Stable Regulators
A single, simple measurement is described that allows the determination of the ESR required to achieve a desired phase margin, using a...
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Picotest
Jul 29, 20111 min read
Power Supply Measurement Techniques: Non-Invasive Phase Margin using the J2111A Current Injector
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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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Picotest
Jul 15, 20101 min read
Broad Injector Product Line Eases Power Supply Stability Analysis
Developed to aid power supply designers in control-loop stability analysis, Picotest’s line of signal injectors are being introduced as...
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