Performence of multichannel FX chip with DC Coupled Schottky CdTe detector

• Autorzy: Kachel M.
• Języki publikacji: EN

Abstrakty

EN

This paper describes the performance of multichannel ASIC (called FX) which has been connected to Schottky CdTe detector by DC coupling. Because of DC coupling, leakage current of the detector flows into readout electronics and changes its performance. The I-V characteristic of CdTe Schottky detector with guard ring have been measured and we have performed both simulation and experimental verification of FX IC behavior vs. detector leakage current. Due to the low values of this detector leakage current (140 pA for bias voltage of 700 V) performance of FX IC is slightly influenced. Measurements performed with low values of detector's leakage current (below 1 nA), show that the gain of readout channel stays constant with changes of leakage current, while the offset voltage at the discrimonator input changes linearly of about 4.5 mV per 100 pA of the detector leakage current. Limitations of DC coupling method are shown based on measurements with Schottky CdTe detector without guard ring, which produces higer leakage current.

Słowa kluczowe

EN

CdTe detector Schottky; CdTe; DC coupled; multichannel ASIC; CSA; PZC

PL

detektor CdTe Schottky'ego; sprzężenie DC; CdTe; ASIC; wielokanałowy układ ASIC

• Wydawca: Polish Academy of Sciences, Committee of Electronics and Telecommunication
• Czasopismo: Electronics and Telecommunications Quarterly
• Rocznik: 2008
• Tom: Vol. 54, No 4
• Strony: 483--492
• Opis fizyczny: Bibliogr. 7 poz., wykr.

Twórcy

autor

Kachel M.

• Department of Measurements and Instrumentation. AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland,

Bibliografia

• 1. T. Tanaka, Y. Kobayashi, T. Mitani, K. Nakazawa, K. Oonuki, G. Sato, T. Takahashi, S. Watanabe: Recent achievements of the high resolution Schottky CdTe diode for y-ray detectors, New Astronomy Reviews, 48, pp. 269-273, 2004.
• 2. M. Chmeissani, C. Frojdh, O. Gal, X. Llopart, J. Ludwig, M. Maiorino, E. Manach, G. Mettivier, M. C. Montesi, C. Ponchut, P. Russo, L. Tlustos, A. Zwerger: First Experimental Tests with a CdTe Photon Counting Pixel Detector Hybridized with a Medipix2 Readout Chip, IEEE Trans. Nucl. Sci., vol. 51, pp. 2379-2385, 2004.
• 3. T. Takahashi, B. Paul, K. Hirose, C. Matsumoto, R. Ohno, T. Ozaki, K. Mori, Y. Tomita: High-resolution Schottky CdTe diode for hard X-ray and gamma-ray astronomy, Nucl. Instrum. Methods, vol. A 436, pp. 111-119, 1999.
• 4. K. Nakazawa, K. Oonuki, T. Tanaka, Y. Kobayashi, K. Tamura, T. Mitani, G. Sato, S. Watanabe, T. Takahashi, R. Ohno, A. Kitajima, Y. Kuroda, M. Onishi: Improvement of the CdTe Diode Detectors using a Guard-ring Electrode.
• 5. ACRORAD Corporation, www.acrorad.co.jp, Japan
• 6. P. Fischer et al.: A Counting CdTe Pixel Detector for hard X-ray and Gamma-ray imaging, IEEE Trans. Nucl. Sci., vol.48, pp. 2401-2404, 2001.
• 7. P. Grybos, R. Szczygiel: Pole-Zero Cancellation Circuit With Pulse Pile-Up Tracking System for Low Noise Charge-Sensitive Amplifiers, IEEE Trans. Nucl. Sci., vol. 55, pp. 583-590, 2008.