By Steve Sandler | January 28, 2020 One method of designing stable control loops is to create an accurate broadband simulation model and...

Control loop stability is critically important. But whether your focus is on power supply design, power integrity, or mixed-signal power...

More information on this revolutionary measurement technology can be found here: https://www.picotest.com/non-invasive-stability-measurem...

Steve Sandler of Picotest and Heidi Barnes of Keysight teach this short course on Power Integrity. This is part 1 (~90 min) as presented...

Many new linear devices, including voltage references, voltage regulators and opamps have internal feedback loops, prohibiting...

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...

BROWSER-CLASS PROBE Several companies manufacture and distribute high-frequency TDR probes. These probes are typically designed for very...

Many engineers are familiar with the Bode plot as an effective stability assessment method. However, some authors suggest and even teach...

The mathematics behind the non-invasive measurement was incorporated into the OMICRON Lab Bode 100 VNA software, sold by Picotest.com,...

In 1938 Hendrik Wade Bode, who worked at Bell Labs, published his asymptotic assessment of phase margin and gain margin, bearing his name...

Some low-dropout regulators (LDOs) use multiple feedback loops to improve output voltage transient response. In many of these cases, some...

A frequency response analyzer (‘FRA’) is often used to measure gain and phase plots of control loops (Bode plots), filter responses and...

Although not quite as accurate as the two-port VNA impedance measurement, the current injection technique has advantages including wide...

The vast majority of design issues are directly or indirectly attributable to control loop stability. The most common offenders: Linear...

As Sandler explains, analysis based on impedance measurements can more thoroughly assess control loop stability than Bode plot...

In this 5-minute video presentation, Steve Sandler discusses how stability impacts circuit performance, offering examples that...

Evaluating the stability of a Point-Of-Load (“POL”) regulator can be performed using both traditional Bode plot and output impedance...

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...

How do you use the Picotest injectors and the Agilent analyzer to measure output impedance and/or non-invasive step loading? For the...

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