Stability 2/2

May 22, 20121 min read

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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Evaluate Feedback Stability When There’s No Test Point

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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FAQ #18: What injection resistor value should I use? Is it okay to use a little larger resistor like

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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Stability Assessment of Fixed Regulators

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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New Technique for Non-Invasive Testing of Regulator Stability

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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Power Supply Measurement Techniques: Non-Invasive Phase Margin using the J2111A Current Injector

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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