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.
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机译:本文报告了一种低噪声,多通道读出集成电路的测试,该集成电路被用作金刚石多像素剂量计的读出电子前端。该系统专为放射治疗应用中的剂量分布测量而开发。第一个10通道原型芯片是在0.18 um CMOS工艺中设计和制造的。每个通道都包括一个带10 pF电容器的电荷积分器和一个双斜率A / D转换器。基于CVD合成单晶金刚石肖特基二极管的金刚石多像素检测器由3×3传感器矩阵制成。整个设备已在Policlinico``Tor Vergata''(PTV)医院用6 MeV放射治疗光子束照射下进行了测试。测量表明,前端输入级有20 fA RMS泄漏电流,而菱形探测器的暗电流可忽略不计,稳定的时间响应和良好的线性行为随剂量和剂量率而变化。这些特性是每个测试通道共有的。
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