This paper reports on the tests of a low-noise, multi-channel readout integrated circuit used as a readout electronic front-end for a diamond multi-pixel dosimeter. The system is developed for dose distribution measurement in radiotherapy applications. The first 10-channel prototype chip was designed and fabricated in a 0.18 um CMOS process. Every channel includes a charge integrator with a 10 pF capacitor and a double slope A/D converter. The diamond multi-pixel detector, based on CVD synthetic single crystal diamond Schottky diodes, is made by a 3 × 3 sensor matrix. The overall device has been tested under irradiation with 6 MeV radio therapeutic photon beams at the Policlinico ''Tor Vergata'' (PTV) hospital. Measurements show a 20 fA RMS leakage current from the front-end input stage and a negligible dark current from the diamond detector, a stable temporal response and a good linear behaviour as a function of both dose and dose rate. These characteristics were common to each tested channel. © 2013 IOP Publishing Ltd and Sissa Medialab srl.
Fabbri, A., Falco, M.D., De Notaristefani, F., Galasso, M., Marinelli, M., Orsolini Cencelli, V., et al. (2013). Dedicated multichannel readout ASIC coupled with single crystal diamond for dosimeter application. JOURNAL OF INSTRUMENTATION, 8(2), C02042-C02042 [10.1088/1748-0221/8/02/C02042].