The Cleopatra ASIC is a 12-channel prototype ASIC for the readout of hydrogenated amorphous silicon sensors used for real-time dosimetry in radiation diagnostic and radiation therapy. The architecture is based on a current to frequency conversion based on the recycling integrator principle in order to cover a dynamic range of four orders of magnitude with high linearity. Three different input amplifier configurations have been implemented in order to check the trade-off between detector capacitance and maximum output frequency. Cleopatra has been designed in CMOS 28 nm technology and succesfully tested in laboratory.
Cleopatra: a 12-channel recycling integrator ASIC for the readout of hydrogenated amorphous silicon detectors in radiotherapy dosimetry / Mazza, G., Wheadon, R., Lenta, F., Buti, C., Fabi, M., Grimani, C., Pallotta, S., Sabbatini, F., Talamonti, C., Villani, M., Aziz, S., Calcagnile, L., Caricato, A.P., Martino, M., Maruccio, G., Monteduro, A.G., Quarta, G., Rizzato, S., Catalano, R., Cirrone, G.A.P., et al.. - In: JOURNAL OF INSTRUMENTATION. - ISSN 1748-0221. - ELETTRONICO. - 20:(2025), pp. C01034.0-C01034.0. [10.1088/1748-0221/20/01/c01034]
Cleopatra: a 12-channel recycling integrator ASIC for the readout of hydrogenated amorphous silicon detectors in radiotherapy dosimetry
Buti, C.;Pallotta, S.;Talamonti, C.;Villani, M.;
2025
Abstract
The Cleopatra ASIC is a 12-channel prototype ASIC for the readout of hydrogenated amorphous silicon sensors used for real-time dosimetry in radiation diagnostic and radiation therapy. The architecture is based on a current to frequency conversion based on the recycling integrator principle in order to cover a dynamic range of four orders of magnitude with high linearity. Three different input amplifier configurations have been implemented in order to check the trade-off between detector capacitance and maximum output frequency. Cleopatra has been designed in CMOS 28 nm technology and succesfully tested in laboratory.
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