Articles Tagged with ''impedance''

We care about maintaining the same differential impedance for the same reason we care about maintaining the same instantaneous impedance of a single-ended (SE) transmission line: to avoid reflections. SIJ’s EAB member Bert Simonovich explains the fundamentals and why it matters.

Check out this description of what is likely the fastest GaN edge-speed ever recorded.

Many designs today include three different value decoupling capacitors, or when using just one capacitor, a small value like 0.1 uF. These recommendations are based on 50-year-old assumptions that do not apply today. It is time to reconsider these out of date, legacy design guidelines.

This article lays out the basics of signal integrity problems, explains s-parameters, and identifies challenges in high-speed design.

We searched for a superior cable for PDN measurements, then decided to create our own. Here’s the story.

Want to know more about the impedance and the encoding schemes adopted by prevailing high-speed I/O (HSIO) standards including PCIe, USB, Thunderbolt, and Ethernet? By looking back at the history of standards, some interesting trends and possible future directions are revealed.

The complex impedance value over frequency for an electric vehicle’s battery cell is a good measure of the internal cell temperature, the state of charge (SoC), and the state of health. Moreover, comparing the battery stack impedance with the single cell impedances can reveal upcoming high contact resistances. Read on for the details of how to do it.

The goal of power integrity (PI) analysis is to ensure not only sufficient but also stable power to all chips in a system. This article uses the example of a DDR4 application to explain the choices surrounding the use of decoupling capacitors to reduce impedance, and which performance parameters are critical to success.

Understanding how to make and interpret power supply impedance is very useful for optimized, low noise power supply design. With a simple pair of homemade probes, it’s easy to make the measurements using a compact VNA. Read on to find out how.

One reason I enjoy attending a conference is the opportunity to browse presentations I would not ordinarily see. I always pick up something new and useful. Here are some from my recent visit to the IEEE EMC Symposium.