Dedicated multichannel readout ASIC coupled with single crystal diamond for dosimeter application

作者：Fabbri A^*; Falco M D; De Notaristefani F; Galasso M; Marinelli M; Cencelli V Orsolini; Tortora L; Verona C; Rinati G Verona

来源：Journal of Instrumentation, 2013, 8(02): C02042.

DOI：10.1088/1748-0221/8/02/C02042

• Materials for solid-state detectors
• Front-end electronics for detector readout
• Analogue electronic circuits
• Pixelated detectors and associated VLSI electronics

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. %26lt;br%26gt;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 x 3 sensor matrix. The overall device has been tested under irradiation with 6 MeV radio therapeutic photon beams at the Policlinico %26quot;Tor Vergata%26quot; (PTV) hospital. %26lt;br%26gt;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.

• 出版日期2013-2