Low-noise analog ASIC for silicon and CdTe sensors

Tetsuichi Kishishita*, Goro Sato, Hirokazu Ikeda, Tadayuki Takahashi, Tatsuya Kiyuna, Yoshio Mito

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


We report on the recent development of a 32-channel low-noise analog front-end ASIC KW03 for hard X-ray and gamma-ray detectors. The ASIC aims for the readout of strip or pixel (pad) detectors utilizing silicon and cadmium telluride (CdTe) as detector materials. Each readout channel includes a charge-sensitive amplifier, bandpass filters and a sample-and-hold circuit. It also includes a leakage current compensation and pole-zero cancellation circuits to meet the various detector requirements. The equivalent noise level of a typical channel reaches 89 e-@0 pF (rms) and shows an input-capacitance characteristic of 7.5 e-/pF between 0 pF and 10 pF with a power consumption of 3 mW per channel. We mounted the ASIC on a low-temperature co-fired ceramic (LTCC) package and evaluated the spectral performance by combining with a CdTe diode detector. As a result, the gamma-ray spectrum of radioactive source 241Am was obtained with a good energy resolution of 2.23 keV (FWHM) for gamma rays of 59.5 keV at -20°C.

Original languageEnglish
Article number5603463
Pages (from-to)2971-2977
Number of pages7
JournalIEEE Transactions on Nuclear Science
Issue number5 PART 3
Publication statusPublished - 2010 Oct


  • Analog front-end
  • ASIC
  • CdTe
  • gamma-ray
  • low-noise
  • VLSI
  • X-ray

ASJC Scopus subject areas

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


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