We present a negative-feedback control structure which forces the analog voltage of digitized preamplifiers to stay-within the ADC input range, even when the preamplifier fall time is long (ms range) and the event rate is high (100 kHz range). A suitable voltage is dynamically added to the preamplifier signal so as to cancel the baseline shifts brought about by event pileup, low-frequency disturbances, hum and microphonisms, so preventing saturation of the ADC. The preamplifier signal is then fully-reconstructed using a sliding-scale scheme, over a dynamic range well larger than that of the ADC.
Active control of the baseline of digitized preamplifiers with sliding-scale correction / A. Pullia, S. Riboldi, G. Franchi, F. Zocca - In: 2004 IEEE nuclear science symposium conference record : nuclear science symposium and medical imaging conference : Rome, Italy, October 16-22, 2004. Volume 3 / [a cura di] J. A. Seibert. - Disco ottico. - Piscataway (New Jersey) : IEEE, 2004. - ISBN 0-7803-8701-5. - pp. 1378-1381 (( convegno Nuclear science symposium and medical imaging conference : NSS/MIC tenutosi a Rome (Italy) nel 2004.
Active control of the baseline of digitized preamplifiers with sliding-scale correction
A. PulliaPrimo
;S. RiboldiSecondo
;F. ZoccaUltimo
2004
Abstract
We present a negative-feedback control structure which forces the analog voltage of digitized preamplifiers to stay-within the ADC input range, even when the preamplifier fall time is long (ms range) and the event rate is high (100 kHz range). A suitable voltage is dynamically added to the preamplifier signal so as to cancel the baseline shifts brought about by event pileup, low-frequency disturbances, hum and microphonisms, so preventing saturation of the ADC. The preamplifier signal is then fully-reconstructed using a sliding-scale scheme, over a dynamic range well larger than that of the ADC.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
