In nuclear spectroscopy, by definition, a distorted signal from a saturated preamplifier cannot contain the correct energy information, being this one directly related to the signal amplitude. In this work, we propose an innovative technique to exploit the charge-conservation principle to extract high-resolution energy information from a deeply saturated charge-sensitive preamplifier (CSP) connected to semiconductor detectors. The previously described "fast-reset" technique enables to reconstruct the energy information from a saturated preamplifier collecting the charge on the input node with a current generator and performing a time-over-threshold (ToT) measurement. However, it requires offline postprocessing of the acquired data. The proposed circuit, instead, requires no postprocessing, thanks to a peculiar time-to-amplitude converter (TAC) that integrates a baseline rejection circuit. In this way, an extension of the preamplifier spectroscopic energy range of a factor 20 or more is possible, with the generation of a signal whose shape is optimized for direct acquisition with a pulse-height analyzer and no additional filtering.

An Innovative Analog Circuit to Retrieve Energy Information From Signals of Deeply Saturated Preamplifiers Connected to Semiconductor Detectors / S. Capra, G. Secci, A. Pullia. - In: IEEE TRANSACTIONS ON NUCLEAR SCIENCE. - ISSN 0018-9499. - 69:7(2022 Jul), pp. 1757-1764. [10.1109/TNS.2022.3178760]

An Innovative Analog Circuit to Retrieve Energy Information From Signals of Deeply Saturated Preamplifiers Connected to Semiconductor Detectors

S. Capra
Primo
;
A. Pullia
Ultimo
2022

Abstract

In nuclear spectroscopy, by definition, a distorted signal from a saturated preamplifier cannot contain the correct energy information, being this one directly related to the signal amplitude. In this work, we propose an innovative technique to exploit the charge-conservation principle to extract high-resolution energy information from a deeply saturated charge-sensitive preamplifier (CSP) connected to semiconductor detectors. The previously described "fast-reset" technique enables to reconstruct the energy information from a saturated preamplifier collecting the charge on the input node with a current generator and performing a time-over-threshold (ToT) measurement. However, it requires offline postprocessing of the acquired data. The proposed circuit, instead, requires no postprocessing, thanks to a peculiar time-to-amplitude converter (TAC) that integrates a baseline rejection circuit. In this way, an extension of the preamplifier spectroscopic energy range of a factor 20 or more is possible, with the generation of a signal whose shape is optimized for direct acquisition with a pulse-height analyzer and no additional filtering.
Spectroscopy; Resistors; Energy resolution; Capacitors; Voltage measurement; Signal resolution; Semiconductor detectors; Gamma-ray detectors; low-noise amplifiers; nuclear electronics; nuclear measurements; radiation detector circuits; radiation detectors; semiconductor detectors; spectroscopy;
Settore ING-INF/01 - Elettronica
Settore FIS/01 - Fisica Sperimentale
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/937482
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