Author's Latest Posts


Wolfspeed GaN: Rugged Enough For Tracking Space Junk, Rugged Enough For 5G


GaN RF devices are used throughout the world on projects in a broad range of applications such as surveillance and weather radar, first responder communications, and improvised explosive device (IED) protection systems, where downtime is not an option. But are they rugged and reliable enough to tackle the harshest environments the telecom market can hand out, especially as it relates to 5G smal... » read more

Reliability Comparison of 28 V – 50 V GaN-on-SiC S-Band and X-Band Technologies


This paper discusses the reliability performance of Wolfspeed GaN/AlGaN high electron mobility transistor (HEMT) MMIC released process technologies, fabricated on 100 mm high purity semi-insulating (HPSI) 4H-SiC substrates. The intrinsic reliability performance of the 28 V and 40 V technologies, with 400 nm and 250 nm gate length, has been characterized with DC accelerated life test (DC-ALT), f... » read more

A Novel Design Method of Highly Efficient Saturated Power Amplifier Based On Self-Generated Harmonic Currents


A novel design method without requiring the special harmonic termination circuit for a highly efficient power amplifier (PA) is proposed. The proposed PA is driven into saturated operation, from the linear to knee region, by adjusting the only fundamental load, and the saturated operation induces self-generated harmonic currents. The current and voltage waveforms can be shaped easily by the har... » read more

DC Bus Switching Performance as Determined by Commutation Loop Parasitics and Switching Dynamics


In this article a 250 kW all-SiC inverter evaluation kit designed around low-inductance, high-speed power modules is used to demonstrate the DC bus switching performance resulting from the interaction among commutation loop parasitics and the switching dynamics. The interplay among the DC bus structure parasitics and near-RF switching dynamics can be quantified in both the time and frequency do... » read more

Accelerating Adoption of SiC Power


The market has heard for many years about wide bandgap product roadmaps and concepts, touting that many possibilities could be available. However, you can’t design in a PowerPoint presentation or a preliminary datasheet, so this article will reinforce that Wolfspeed SiC power has moved way beyond any hype, talk, and fake news and has pioneered the widespread adoption of silicon carbide power ... » read more