We present a time-domain digital filtering technique able to eliminate the ringing of preamplifier signals. The preamplifier signal is sampled by an ADC and then processed by a digital filter, whose aim is to eliminate the ringing while minimizing the loss of high-frequency information. We developed such a filtering technique for the case of a charge-sensitive preamplifier for gamma-ray spectroscopy installed far away from the detector/FET cryogenic assembly. With such a setup a damped oscillation is caused by the long connection cable acting as a delay line along the feedback loop. We could completely eliminate the ringing in the output signals and maintain, at the same time, a large bandwidth and a high loop gain. Experimental results are shown.
De-oscillating preamplifier signals through digital filtering techniques / F. Zocca, A. Pullia - In: 2006 IEEE Nuclear Science Symposium Conference Record : Nuclear Science Symposium; Medical Imaging Conference; 15th International Workshop on Room-Temperature Semiconductor X- and Gamma-Ray Detectors; Special Focus Workshops / [a cura di] B. Phlips. - Piscataway : IEEE, 2007. - ISBN 1-4244-0560-2. - pp. 986-989 (( convegno 2006 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room Temperature Semiconductor Detector workshop tenutosi a San Diego, CA, USA nel 2006.
De-oscillating preamplifier signals through digital filtering techniques
F. ZoccaPrimo
;A. PulliaUltimo
2007
Abstract
We present a time-domain digital filtering technique able to eliminate the ringing of preamplifier signals. The preamplifier signal is sampled by an ADC and then processed by a digital filter, whose aim is to eliminate the ringing while minimizing the loss of high-frequency information. We developed such a filtering technique for the case of a charge-sensitive preamplifier for gamma-ray spectroscopy installed far away from the detector/FET cryogenic assembly. With such a setup a damped oscillation is caused by the long connection cable acting as a delay line along the feedback loop. We could completely eliminate the ringing in the output signals and maintain, at the same time, a large bandwidth and a high loop gain. Experimental results are shown.Pubblicazioni consigliate
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