Signal characteristics and signal processing in read-out electronics for radiation detectors

Goran Panjkovic, David Fitrio, Stewart Midgley, Andrew Berry, Anand Mohan

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

2 Citations (Scopus)


The most common form of read-out electronics for radiation detection at the pixel basis can be described as a signal processing channel consisting off: detector pixel, preamplifier, pulse shaper and A/D converter. The signal generation starts when a photon interacts with a detector, resulting in a charge which amount is proportional to the photon energy. The charge is further processed by either a current or a charge preamplifier. The advantages of the charge over the current preamplifiers for radiation detectors for bio-medical applications are explained, focusing on the differences between signal and noise gains. Two most common amplifier topologies, differential amplifier and folded cascode, are discussed and compared. The pulse shaper roles are noise reduction and shaping the output signal into forms suitable for further processing. Factors that affect signals of the preamplifier and the pulse shaper are elaborated. The final stage of the channel is an A/D converter. The paper explains why the flash ADC is the most common choice. The key advantages and drawbacks of CMOS technology for detector applications are presented, including radiation effects. Detrimental effects, such as pile-ups and charge sharing, which are caused by the random properties of photons, are also briefly explained.

Original languageEnglish
Title of host publicationISIC-2009 - 12th International Symposium on Integrated Circuits, Proceedings
Number of pages4
Publication statusPublished - 2009
Event12th International Symposium on Integrated Circuits - Singapore, Singapore
Duration: 14 Dec 200916 Dec 2009
Conference number: 12


Conference12th International Symposium on Integrated Circuits


  • CdTe
  • Charge preamplifier
  • Detector
  • Pile-up
  • Pulse shaper

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