Performance of a low noise front-end ASIC for Si/CdTe detectors in compton gamma-ray telescope

Hiroyasu Tajima, Tatsuya Nakamoto, Takaaki Tanaka, Shingo Uno, Takefumi Mitani, Eduardo Do Couto E. Silva, Yasushi Fukazawa, Tuneyoshi Kamae, Grzegorz Madejski, Daniel Marlow, Kazuhiro Nakazawa, Masaharu Nomachi, Yu Okada, Tadayuki Takahashi

Research output: Contribution to journalConference articlepeer-review


Compton telescopes based on semiconductor technologies are being developed to explore the gamma-ray universe in an energy band 0.1-20 MeV, which is not well covered by the present or near-future gamma-ray telescopes. The key feature of such Compton telescopes is the high energy resolution that is crucial for high angular resolution and high background rejection capability. The energy resolution around 1 keV is required to approach physical limit of the angular resolution due to Doppler broadening. We have developed a low noise front-end ASIC, VA32TA, to realize this goal for the readout of Double-sided Silicon Strip Detector (DSSD) and Cadmium Telluride (CdTe) pixel detector which are essential elements of the semiconductor Compton telescope. We report on the design and test results of the VA32TA. We have reached an energy resolution of 1.3 keV (FWHM) for 60 keV and 122 keV at 0̊ Cwith a DSSD and 1.7 keV (FWHM) with a CdTe detector.

Original languageEnglish (US)
Article numberN18-5
Pages (from-to)396-401
Number of pages6
JournalIEEE Nuclear Science Symposium Conference Record
StatePublished - 2003
Event2003 IEEE Nuclear Science Symposium Conference Record - Nuclear Science Symposium, Medical Imaging Conference - Portland, OR, United States
Duration: Oct 19 2003Oct 25 2003

All Science Journal Classification (ASJC) codes

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


  • Cadmium Telluride
  • CdTe
  • Compton telescope
  • Gamma-ray
  • SSD
  • Semiconductor detector
  • Silicon Strip Detector


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