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
;G. Secci;A. PulliaUltimo
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.File | Dimensione | Formato | |
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