The technology developed here is fundamental to a wide range of NASA PMAD and motor control applications. For DC-DC converters, the power ICs developed in this program will connect power sources in a wide variety of NASA mission systems with power sources as Solar arrays, Brayton rotating unit, stirling radioscopes, and fuel cells with various loads like electric propulsion, communications systems, instruments and actuators. The radiation-hardness, high-temperature capability, fast switching speeds, compact form factor and low mass offered by the proposed AlGaN/GaN-on-SiC power integrated circuit will be invaluable for future NASA science missions. A power IC is also the building block for the interface between energy storage devices like batteries and flywheels with the energy sources and loads. Switchmode power supplies improved by high frequency, high temperature power switch is critical for NASA synthetic aperture RADAR's (SAR) antenna array T/R modules. T/R modules typically operate in a pulsed mode, drawing current pulses from a power supply on a periodic basis determined by the operation of the overall RADAR system. The ripple in the output voltage of the T/R module power supply impacts the performance of the RADAR system.