Items Tagged with 'TDR'

Measuring the Bulk Dielectric Constant (Dk) on a Microstrip with a TDR

If you have designed a controlled impedance transmission line based on a PCB stack-up, how do you know if the PCB fabrication house or another vendor built your stack-up to meet your controlled impedance specification?

How to Avoid Gibbs Ringing Artifacts in Measurements

It’s easy to make a measurement in most instruments, but it’s sometimes hard to know what is real and what is an artifact. Gibbs Ringing is a common artifact in high-speed scope and TDR measurements that can lead you astray unless you understand how to avoid it. We reveal the secrets of avoiding this important artifact.

Should You Worry About 90 Degree Bends in Circuit Board Traces?

SIJ technical editor Eric Bogatin reflects on reflections… “Do corners in traces on circuit boards cause reflections? Of course, they do. Do the reflections cause problems and should you worry? ….it depends.” Read on to see what he means.

Characteristic Impedance – Where SI/PI Worlds Collide

Sometimes, when SI and PI worlds collide, we get the best of both worlds. By borrowing a simple impedance measuring technique from the PI world, we have another tool at our disposal to measure true characteristic impedance from a uniformly designed transmission line in the SI world, read on to learn more.

Measuring pH and fF With a TDR Using a Cursor Measurement

This article explains the steps to use a TDR to measure very small values of inductance and capacitance, including tips for better measurements.

The Goldilocks TDR

It pains me to say this, but there is such a thing as turning the TDR up too high and it is also easy not to have enough. If there is a “too high,” and a “not high enough,” there must also be a “just‐right,” or Goldilocks, setting. Using measurements, and a smattering of math, the Goldilocks setting answers
will be clear. Read on to find out how.

How Interconnects Work: Traces Between Parallel Planes

Transverse electromagnetic waves are used to transmit the signal between components while PPW waves are used to deliver power to the components. Both waves are useful, but they have to be separated. Yuriy Shlepnev, member of the SIJ Editorial Advisory Board, explains why.

Return Current Transition Between Planes

Return current for a signal always finds a way to flow as close to the signal as possible, thus minimizing the magnetic energy stored in the loop defined by the signal and its return path. So, the return current path is the combination of conduction paths that together minimize the stored magnetic energy. Some elements of the return current path may be part of the design and other elements may be unintentional.