Si and CdTe detector readout ASIC in 0.35μm CMOS for energetic electron spectroscopy for space application

TARANIS (Tool for the Analysis of RAdiation from lightNIng and Sprites) is a microsatellite aimed to atmospheric storms study. It embarks among other instruments IDEE (Instrument Detecteur d'Electron Energetique) which is dedicated to energetic electron characterization in the range from 70keV to 4Mev. To cover such awide ran ge, two types of detectors are required: Silicon (Si) and Cadmium Telluride (CdTe) based detector for the 70keV to 700keV and for the 300keV to 4MeV respectively. Si detectors are placed in front of CdTe detectors for angle measurement. Although the readout architecture of both detectors are similar, the time constants involved in collection of the charges for Si and CdTe are differents by almost 21 decades (60ns for Si and 3f.1s for CdTe). Two different readout circuits are thus required. CdTe type channels need to make use of Pole Zero Cancellation (PZC) technique in order not to impede the frequency of operation. Performance of the design has been characterized on a test board as well as interfaced with detectors. Finally, results of its characterized Single Event Latchup (SEL) performance is given.