This work deals with the digitization of charge-preamplifier waveforms obtained from X-ray and$gamma$-ray sensors. We suggest that the well-known “sliding-scale correction” structure can be inserted into a negative-feedback control loop to cancel the signal walks brought about by event pileup, low-frequency disturbances, microphonism, and hum. Cancellation of the walks permits to use the full analog-to-digital converter (ADC) range for the signals, even in high event rate conditions. The signal distortion caused by such cancellation is then eliminated numerically by the sliding-scale mechanism. As a result an extended dynamic range is obtained. Using a 12-bit ADC we got two extra bits to accomodate the baseline walks and 1.14 to 1.43 extra bits on individual signals with 0.1 to 1 micro s. rise time.
Digitized Preamplifiers: A Circuit Structure for Sliding-Scale Optimization of the ADC Range / A. Pullia,S. Riboldi,G.M. Franchi,F.Zocca. - In: IEEE TRANSACTIONS ON NUCLEAR SCIENCE. - ISSN 0018-9499. - 53:1 part.2(2006 Feb), pp. 247-252.
|Titolo:||Digitized Preamplifiers: A Circuit Structure for Sliding-Scale Optimization of the ADC Range|
PULLIA, ALBERTO (Primo)
RIBOLDI, STEFANO (Secondo)
ZOCCA, FRANCESCA (Ultimo)
|Parole Chiave:||Digitized preamplifier X-ray spectroscopy gamma-ray spectroscopy sliding scale correction|
|Settore Scientifico Disciplinare:||Settore ING-INF/01 - Elettronica|
|Data di pubblicazione:||feb-2006|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1109/TNS.2006.869822|
|Appare nelle tipologie:||01 - Articolo su periodico|