We have developed a prototype cadmium telluride (CdTe) pixel detector for future use in focusing hard X-ray telescopes. We adopted a hybrid configuration where each CdTe sensor pixel is vertically connected to a corresponding pixel cell fabricated in a readout ASIC. This configuration is suitable for detectors with high pixel density to reduce a stray capacitance between readout signal lines. The readout chip consists of a 12 x 12 matrix of identical 270 μm x 270 μm pixel cells, and was implemented with TSMC 0.35-μm CMOS technology. Each pixel cell contains a charge-sensitive amplifier, pole-zero cancellation circuit, low-pass filter, comparator, and peak/bottom-hold circuit. We succeeded to obtain detector signals from all the 144 channels, showing a equivalent noise charge distribution of 66±4 e- (rms). The linearity is maintained within ±1 % up to 3.5 fC, which corresponds to - 100 keV for CdTe. The detector exhibits good spectral performance with 870 eV (FWHM) at 59.5 keV. The power consumption is 150 μW per pixel, and 48 mW in total.
|ホスト出版物のタイトル||IEEE Nuclear Science Symposium Conference Record|
|出版ステータス||Published - 2009|
|イベント||2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009 - Orlando, FL|
継続期間: 2009 10 25 → 2009 10 31
|Other||2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009|
|Period||09/10/25 → 09/10/31|
ASJC Scopus subject areas