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Proceedings Paper

Experimental analysis of current noise spectra in CdTe detectors
Author(s): Giuseppe Bertuccio; Giorgio Ferrari; Pietro Gallina; Marco Sampietro; Ezio Caroli; Ariano Donati; Waldes Dusi
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Paper Abstract

In this paper we analyze in detail a peculiar behavior of CdTe detectors, namely the fact that in conjunction with a typical resistive electrical characteristic in which the current is proportional to the externally applied biasing voltage through an equivalent detector resistance, the detector shows a noise level well above the corresponding Johnson noise and close to the shot noise of the standing current. By using a correlation spectrum analyzer, a careful and extensive experimental analysis of the current noise behavior of CdTe detectors for X and (gamma) ray has been performed. The current noise spectra have been measured over a wide range of frequencies, from below 1Hz up to 100kHz and operating points from 0V up to 150V. In addition to a strong 1/f component, a white noise is present at the level of the shot noise of the standing current and extending in frequency for a limited range related to the carriers transit time across the detector.

Paper Details

Date Published: 19 October 1999
PDF: 7 pages
Proc. SPIE 3768, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics, (19 October 1999); doi: 10.1117/12.366606
Show Author Affiliations
Giuseppe Bertuccio, Politecnico di Milano (Italy)
Giorgio Ferrari, Politecnico di Milano (Italy)
Pietro Gallina, Politecnico di Milano (Italy)
Marco Sampietro, Politecnico di Milano (Italy)
Ezio Caroli, Istituto TESRE/CNR (Italy)
Ariano Donati, Istituto TESRE/CNR (Italy)
Waldes Dusi, Istituto TESRE/CNR (Italy)


Published in SPIE Proceedings Vol. 3768:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics
Ralph B. James; Richard C. Schirato, Editor(s)

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