Impedance Measurement 4/5

Sep 15, 20141 min read

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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PDN Basics For Power Designers: Keep Impedance Flat. (Part two of the video series.)

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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PDN Basics For Power Designers: What is PDN? (Part one of the video series.)

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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Match impedances when making measurements

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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PCB characteristics affect PDN performance

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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Measure small impedances with Rogowski current probes

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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Five Things Every Engineer Should Know About Bode Plots

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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Non-Invasively Assess Your Multiple-Loop LDO’s Stability

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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Troubleshooting Distributed Power Systems: Measuring Ripple (Part 7 of the ongoing series)

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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PDN Basics – Paralleling Tantalum and Ceramic Capacitors Can Be Risky

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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Troubleshooting Distributed Power Systems: Using Current Injectors (Part 5 of the ongoing video seri

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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Five Things Every Engineer Should Know About PDN

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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Troubleshooting Distributed Power Systems: Measuring Impedance Using VNAs (2-Port) (Part 4 of the on

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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Troubleshooting Distributed Power Systems: Measuring Impedance Using Vector Network Analyzers (One-P

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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