Phase Margin

Dec 27, 20211 min read

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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Tektronix App Note: Measuring the Control Loop Response of a Power Supply Using an Oscilloscope

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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Characterizing and Modeling Switch Mode Power Supplies (Mar 15)

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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Impedance measurements stabilize op-amp buffers

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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FAQ #22: So how does this non-invasive measurement relate to phase margin and gain margin?

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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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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Introduction to the J2110A Solid State Injector

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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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

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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