Expert Insights

Parasitic oscillations are one of the four typical causes for emissions in EMI/EMC problems. Try to reduce the gain or break the feedback and the problem could be solved at low cost.

Did you ever wonder why we use 0.1 ohm (and sometimes 0.5 ohm) for the ground impedance value for plug-and-socket connected equipment?

Consider a two-sided PCB with a single trace on top and full copper ground plane on the bottom.

The “power distribution system” is all parts of an electric system between the “bulk power source” and the consumer’s service-entrance equipment.

After causing a bit of a stir in the compliance testing industry in the last few years, the FCC recently defused some tension when they accepted a pair of US-based Accreditation Bodies to accredit laboratories in foreign lands.

Many EMI and SI problems are related with a combination of inductance and capacitance without losses.

Recently, a colleague remarked to me, “Philosophically, of course, there is no such thing as absolute safety.” Could this be true? Is there a situation where a man could not possibly injure himself?

Reducing the duty cycle (the pulsewidth) reduces the low-frequency spectral content of the waveform, but does not affect the high-frequency content.

China’s homegrown “WeChat” application has nearly 900 million users. Need a car? Pay a check? Send someone some cash? Rate a dining venue? Make a video call? Send an endless series of silly emojis? WeChat is the platform, at least in China. It’s IM, Facebook, Tripadvisor and Skype all in one. And a gateway to to the Internet of Things.

The effectiveness of different materials for shielding can be tested using near field probes and your vector network analyzer (VNA).