A commandable pulse height analysis system based on custom VLSI ASICs for the Cassini space mission

The authors have implemented a new commandable threshold PHA-accumulation unit for the MIMI/LEMMS particle detection instrument of the Cassini mission to Saturn. The implementation is based on two full custom VLS ASICs specifically designed, fabricated, and space qualified for this project. The present system overcomes common fine tuning pre-flight and in-flight calibration difficulties associated with conventional fixed threshold systems of past missions, while significantly reducing weight and power. A brief description of the design as well as experimental results are presented.