Development of a Hybrid CdTe pixel detector with a low-noise front-end ASIC

Goro Sato*, Tetsuichi Kishishita, Hirokazu Ikeda, Takuto Sakumura, Tadayuki Takahashi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


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.

Original languageEnglish
Title of host publicationIEEE Nuclear Science Symposium Conference Record
Number of pages4
Publication statusPublished - 2009
Event2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009 - Orlando, FL
Duration: 2009 Oct 252009 Oct 31


Other2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009
CityOrlando, FL


  • Analog front-end
  • ASIC
  • CdTe
  • Gamma-ray
  • Low noise
  • Pixel
  • VLSI
  • X-ray

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging


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