PDN Basics For Power Designers: Impedance Matching Is Critical. (Part three of the video series.)
In modern electronic systems, the performance of FPGAs, CPUs, and other high-speed logic devices depends on the power distribution...
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Picotest
Sep 15, 20141 min read
PDN Basics For Power Designers: Keep Impedance Flat. (Part two of the video series.)
In modern electronic systems, the performance of FPGAs, CPUs, and other high-speed logic devices depends on the power distribution...
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Picotest
Sep 15, 20141 min read
PDN Basics For Power Designers: What is PDN? (Part one of the video series.)
In modern electronic systems, the performance of FPGAs, CPUs, and other high-speed logic devices depends on the power distribution...
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Picotest
Aug 15, 20142 min read
Match impedances when making measurements
Recently, I used a shielded coaxial cable to measure power supply ripple and the results were even noisier than using an oscilloscope...
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Picotest
Jul 1, 20142 min read
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...
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Picotest
Jun 19, 20141 min read
Improve Performance And Reduce Cost
Engineers are under constant pressure to improve the performance of their products while reducing product cost. The key to doing so is a...
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Picotest
Mar 31, 20141 min read
PCB characteristics affect PDN performance
Since no impedance path is perfectly flat, we need to make some design adjustments. This article aims to help you make compromises that...
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Picotest
Mar 19, 20141 min read
Measure PDN on a budget
There are many good analyzers available for measuring PDN High performance VNAs are available from all of the major test equipment...
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Picotest
Feb 5, 20141 min read
Measure small impedances with Rogowski current probes
You’re probably familiar with clamp on current probes, but chances are you don’t know much about the Rogowski current probe. A Rogowski...
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Picotest
Jan 22, 20142 min read
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...
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Picotest
Jan 6, 20141 min read
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...
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Picotest
Dec 10, 20131 min read
Troubleshooting Distributed Power Systems: Measuring Ripple (Part 7 of the ongoing series)
And by taking measurements across all three test domains, designers can trace power supply ripple-related problems back to root causes...
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Picotest
Nov 26, 20131 min read
PDN Basics – Paralleling Tantalum and Ceramic Capacitors Can Be Risky
Because of their high ESL compared to ceramic, tantalum capacitors are not the optimum choice for high frequency decoupling. Paralleling...
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Picotest
Nov 7, 20132 min read
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...
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Picotest
Oct 7, 20131 min read
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...
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Picotest
Oct 1, 20131 min read
Five Things Every Engineer Should Know About PDN
Keep it flat Most PDN books tell you that the best performing PDN impedance looks flat over frequency. That is because noise signals are...
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Picotest
Sep 13, 20131 min read
FAQ #30: Can the Bode 100 measure complex permeability of Inductors/Chokes with some additional adap
It can measure impedance and that can get you there. We measure permeability by relating the inductance and physical core parameters such...
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Picotest
Sep 8, 20131 min read
Troubleshooting Distributed Power Systems: Measuring Impedance Using VNAs (2-Port) (Part 4 of the on
Shunt through, wideband measurements can be made from approximately 100 microohms to a few ohms. This is the measurement performed by...
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Picotest
Aug 27, 20131 min read
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...
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Picotest
Aug 16, 20131 min read
Troubleshooting Distributed Power Systems: Measuring Impedance Using Vector Network Analyzers (One-P
This video focuses on single-port measurements, describing how they can be applied to low power circuits such as linear regulators,...
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