NDLI: The AGATA charge-sensitive preamplifiers with built-in active-reset device and pulser

Content Provider	IEEE Xplore Digital Library
Author	Pullia, A. Pascovici, G. Cahan, B. Weisshaar, D. Boiano, C. Bassini, R. Petcu, M. Zocca, F.
Copyright Year	2004
Description	Author affiliation: Dept. of Phys., Milan Univ., Italy (Pullia, A.)
Abstract	New charge-sensitive preamplifiers for the highly segmented HPGe detectors of AGATA have been designed and built, as developed to read out simultaneously the segment- and the core-electrode signals. A new fast-reset circuitry is used to reduce the dead time brought about by a background of energetic particles in the 10 to 100 MeV range that could hit the detectors in nuclear-physics experiments with radioactive beams. The input field effect transistor and the feedback resistor are placed in the detector cryostat and cooled to ~120 K to minimize the electronic noise. The FET is biased at an unusually low drain voltage (2 V) because a power budget of only 20 mW per FET is allowed for thermal-dissipation constraints in the cryostat. A differential output driver is used to transmit the analog signals through 5-m twisted-pair LVDS cables to an external flash-ADC module. A precise programmable pulser has been developed and installed on a side of the "core" preamplifier board, to be used to inject a calibration pulse onto the core electrode and thereafter to all segments through the detector bulk capacitance.
Starting Page	1411
Ending Page	1414
File Size	1197746
Page Count	4
File Format	PDF
ISBN	0780387007
ISSN	10823654
e-ISBN	0780387015
DOI	10.1109/NSSMIC.2004.1462504
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-10-16
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Preamplifiers Detectors FETs Signal design Circuits Particle beams Feedback Resistors Nuclear electronics Low voltage
Content Type	Text
Resource Type	Article

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