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A multibit continuous-time delta-sigma ADC for direct conversion of CdZnTe detector arrays

: Völker, M.; Zhou, H.; Hauer, J.

Volltext urn:nbn:de:0011-n-1321021 (768 KByte PDF)
MD5 Fingerprint: 47b617544e74cae769c95e2329c20209
Erstellt am: 21.5.2010

Elst, G. ; Fraunhofer-Institut für Integrierte Schaltungen -IIS-, Institutsteil Entwurfsautomatisierung -EAS-, Dresden:
Dresdner Arbeitstagung Schaltungs- und Systementwurf, DASS 2010 : 18. - 19. Mai 2010, Dresden
Stuttgart: Fraunhofer Verlag, 2010
ISBN: 978-3-8396-0126-6
Dresdner Arbeitstagung Schaltungs- und Systementwurf (DASS) <2010, Dresden>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IIS ()

Beside the traditional signal processing channel for radiation detector arrays based on multiple analog filter stages, a new direct analogue to digital conversion strategy is presented in this paper. The main building block of the new channel topology is a continuous-time analog to digital converter. This paper presents the design and implementation of a 78 dB SNR multibit continuous-time delta-sigma ADC. Such ADC is dedicated to the readout of CdZnTe detector arrays at the bandwidth of 625 kHz. This ADC offers the possibility to move most signal processing steps like pulse shaping, energy detection and timing analysis into the digital domain. The die area and power consumption can be reduced by using digital filtering and advanced signal processing algorithmen. The delta-sigma ADC has been designed in an 180nm 1P6M CMOS technology. The circuit consumes 3.8 mW from 1.8 Volt supply.