A compact single-ADC back-end module for the derandomization, acquisition and memorization of 16 spectra from high-rate multielement radiation detectors has been designed and characterized. The input signals, as provided by external peak stretchers, feed Sample&Hold circuits operated independently, which makes it possible to capture randomly-occurring events even in the worst case of time coincidences in different detection elements. The stored signals are then passed along synchronously to a common 12-bit 10MHz flash ADC, by means of a switch array operated as a multiplexer. This provides derandomization of the arrival times of the events. A maximum count rate of about 500 kcounts/s/channel is featured. An homogeneous processing rate among the channels is guaranteed by driving the switches with an "intelligent" digital circuitry implemented in two programmable-logic units. Sliding-scale correction is used to reduce by two order of magnitudes the ADC native differential nonlinearity, and so to meet the requirements of the spectroscopic applications. The measured pulser-peak noise is 1.5 bins r.m.s. over a full scale of ∼4000 bins.
A compact back-end module for high-rate multielement X-ray spectrometers and γ-ray imagers / A. Pullia, A. Longoni - In: 2000 IEEE Nuclear science symposium conference record. Volume 2Piscataway, USA : IEEE, 2000. - ISBN 0-7803-6503-8. - pp. 12/176-12/180 (( convegno Nuclear science symposium and medical imaging conference tenutosi a Lyon nel 2000.
|Titolo:||A compact back-end module for high-rate multielement X-ray spectrometers and γ-ray imagers|
PULLIA, ALBERTO (Primo)
|Parole Chiave:||data acquisition ; radiation detectors ; field programmable gate arrays ; X ray spectroscopy ; gamma ray spectrometry|
|Settore Scientifico Disciplinare:||Settore ING-INF/01 - Elettronica|
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
|Data di pubblicazione:||2000|
|Enti collegati al convegno:||IEEE|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1109/NSSMIC.2000.949964|
|Tipologia:||Book Part (author)|
|Appare nelle tipologie:||03 - Contributo in volume|