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

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83 Scopus citations


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 (application-specific integrated circuit), 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 [full-width at half-maximum (FWHM)] for 60 and 122 keV at 0°C with a DSSD and 1.7 keV (FWHM) with a CdTe detector.

Original languageEnglish (US)
Pages (from-to)842-847
Number of pages6
JournalIEEE Transactions on Nuclear Science
Issue number3 III
StatePublished - Jun 2004

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


  • Analog integrated circuits
  • Cadmium telluride
  • Compton camera
  • Gamma-ray detectors
  • Silicon radiation detectors


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