Tuesday, October 27, 2020
Presenter: Dr. Zach Griffith, Teledyne Scientific Company
This talk will review the development of high-power solid-state power amplifiers (PAs) operating between 50-250GHz using the 250nm InP HBT technology at Teledyne Scientific. The high maximum oscillation frequency fmax of the technology combined with a 5V breakdown voltage has enabled the realization of high-gain, world-class mmWave and THz PAs. After reviewing the underlying InP HBT technology and comparing with competitive technologies, the key design tradeoffs for mmWave and THz PA design will be reviewed, including appropriate HBT topology, choice of wiring environment, DC bias distribution, sources of instability, PA-cell power matching, and RF combining methods. State-of-the-art PA results between 50-250GHz will be reviewed and technology challenges and limitations for maintaining high transistor W/mm operation above 200GHz will be discussed. Lastly, system examples will be presented to show the prospects and opportunities these high-frequency InP HBT PAs have in next-generation communications (5G and 6G), radar, and instrumentation systems.
Dr. Zach Griffith is a principle engineer in the area of mmWave and RF MMIC design with the Teledyne Scientific Company. In 2005 he received his PhD in electrical engineering from UC Santa Barbara related to his work demonstrating record bandwidth InP HBT transistors. Since joining Teledyne in 2008, his efforts have transitioned to InP HBT and HEMT MMIC design. Dr. Griffith is a senior member of IEEE, has authored over 140 publications, and holds six patents associated with this work.