Most of the time: Schematics and PCBs for systems with data paths up to 10Gbps, High-speed digital design, Analogue, PSUs, FPGAs, etc. Some of the time: Data links to 26Gbps, from multiple ADCs, via optical, Signal integrity, Power integrity. The rest of the time (the fun bits): Analysis of the Space-radiation environment, measuring the effects of high-energy particles on semiconductors.
