Speaker
Description
Summary
The Micro Vertex Detector (MVD) is the innermost sensitive layer of the PANDA
experiment at the new Facility for Antiproton and Ion Research (Fair) in
Darmstadt. The MVD will be composed of two kind of sensors: hybrid pixels and
double sided strips. The front end electronics of the MVD will be placed at a
few centimetres from the interaction point, which is constituted by a fixed
target, where high radiation levels are expected. Therefore the ASIC have to be
designed with radiation tolerant techniques, both in terms of Total Ionizing
Dose (TID) and of Single Event Upset (SEU). The TID issue has been addressed
using a deep sub micron technology as the CMOS 130 nm, which has proven an
intrinsic good tolerance to radiation induced damage. On the other hand these
technologies have increased their sensitivity to SEU, due to the reduced size of
the active devices. Therefore SEU mitigation techniques have to be applied at
circuit level, in order to prevent data corruption in the registers and failure
of the control logic. Various architectures and techniques are proposed in
literature, which essentially show a trade off between protection level and area
penalty. Some of these techniques have been implemented in the circuit
prototypes for the readout of the MVD pixel sensors, based on the space
constraints. The prototypes have been then tested at the Legnaro INFN facility
with ions of various species and energies, in order to asses the effective
capability of SEU mitigation. The obtained results have shown some limitation in
the implementation of these techniques, which will be used as a guideline for
the design of the final ASIC.
