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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App Note: 2-Port Impedance Measurement using the P2102A Probe and ZNL6 VNA
By Benjamin Dannan and Steven Sandler, Picotest.com High speed Printed Circuit Board (PCB) design requires well designed Power Delivery...
App Note: 2-Port Impedance Measurement using the P2102A Probe and Copper Mountain Tech 2-Port VNA
By Benjamin Dannan and Steven Sandler, Picotest.com, and Subbaiah M. Pemmaiah, Coppermountaintech.com High speed Printed Circuit Board...
Power Integrity Assessment and Optimization in the Frequency Domain
IEEE MTT-S Latin America Microwave Conference: https://lamc-ieee.org/ Registration: http://bit.ly/lamc-2021-sandler Full Program:...
App Note: 2-Port Impedance Measurement using the P2102A Probe and Bode 100 VNA
By Benjamin Dannan and Steven Sandler, Picotest.com High speed Printed Circuit Board (PCB) design requires well designed Power Delivery...
Bode Plots are Overrated
Control loop stability is critically important. But whether your focus is on power supply design, power integrity, or mixed-signal power...
Introduction to NISM – Non-Invasive Stability Measurement with Steve Sandler
More information on this revolutionary measurement technology can be found here: https://www.picotest.com/non-invasive-stability-measurem...
Introduction to Power Integrity – Video
Steve Sandler of Picotest and Heidi Barnes of Keysight teach this short course on Power Integrity. This is part 1 (~90 min) as presented...
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...
Essential 1-Port PDN PROBE: Applications Abound
BROWSER-CLASS PROBE Several companies manufacture and distribute high-frequency TDR probes. These probes are typically designed for very...
Three Stability Assessment Methods Every Engineer Should Know About
Many engineers are familiar with the Bode plot as an effective stability assessment method. However, some authors suggest and even teach...
Software Enables Accurate Stability Test, Improves Non-Invasive Phase Margin Measurement Accuracy
The mathematics behind the non-invasive measurement was incorporated into the OMICRON Lab Bode 100 VNA software, sold by Picotest.com,...
Five Things Every Engineer Should Know About Bode Plots
In 1938 Hendrik Wade Bode, who worked at Bell Labs, published his asymptotic assessment of phase margin and gain margin, bearing his name...
Non-Invasively Assess Your Multiple-Loop LDO’s Stability
Some low-dropout regulators (LDOs) use multiple feedback loops to improve output voltage transient response. In many of these cases, some...
Combination VNA/FRAs Offer More Capability And Lower Cost
A frequency response analyzer (‘FRA’) is often used to measure gain and phase plots of control loops (Bode plots), filter responses and...
Troubleshooting Distributed Power Systems: Using Current Injectors (Part 5 of the ongoing video seri
Although not quite as accurate as the two-port VNA impedance measurement, the current injection technique has advantages including wide...
How to Solve 8 of 10 Design Issues
The vast majority of design issues are directly or indirectly attributable to control loop stability. The most common offenders: Linear...
Troubleshooting Distributed Power Systems: Impedance Is the Critical Measurement (Part 2 of the ongo
As Sandler explains, analysis based on impedance measurements can more thoroughly assess control loop stability than Bode plot...
Assessing Point-Of-Load Regulators Using Non-Invasive Techniques
Evaluating the stability of a Point-Of-Load (“POL”) regulator can be performed using both traditional Bode plot and output impedance...
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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