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...

Fortunately, a new technique permits non-invasive stability testing of such devices.1 Designers can evaluate stability by measuring (on...

Is it possible to design an unconditionally stable linear voltage regulator? In fact, many believe that most regulator ICs are...

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...

Many articles and application notes describe the extraction of phase margin, using a non-invasive technique that extracts the phase...

There are cases where a Bode (gain?phase) plot cannot be obtained from a control loop. For example, a three terminal regulator or hybrid...

Designing a reliable circuit that employs a voltage reference requires a more detailed look at device parameters than most data sheets...

Output impedance is the key to testing filter and regulator phase margin, even when the control loop is inaccessible. Many voltage...

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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When measuring a circuit or device with our network analyzers, engineers generally inject a signal and believe that the measured results...

Developed to aid power supply designers in control-loop stability analysis, Picotest’s line of signal injectors are being introduced as...