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144 channel measurement IC for CZT sensors with energy and time resolution

 
: Voelker, Matthias; Carrascal, Jorge; Soriano-Asensi, Antonio; Cela, José M.; Sanchez, Filomeno; Perez, Jose M.; Hauer, Johann; Benlloch, Jose Maria

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Institute of Electrical and Electronics Engineers -IEEE-; IEEE Instrumentation and Measurement Society:
IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2013. Vol.1 : Minneapolis, Minnesota, USA, 6 - 9 May 2013
New York, NY: IEEE, 2013
ISBN: 978-1-4673-4621-4 (Print)
ISBN: 978-1-4673-4622-1
S.908-911
International Instrumentation and Measurement Technology Conference (I2MTC) <2013, Minneapolis/Minn.>
Englisch
Konferenzbeitrag
Fraunhofer IIS ()

Abstract
A 144 channel measurement IC for CZT detectors, used for PET, is presented. Each channel consists of a charge sensitive amplifier, a fast and a slow signal shaper, a peak sampler for the energy acquisition and an event detector based on a time to digital converter to generate an accurate time stamp for each event. The channels are multiplexed to a fast pipeline ADC on demand. Measurement results for the ASIC showed a noise equivalent input charge of 800 e-rms and a time resolution of 737 ps rms. Evaluation results with a CZT detector yielded an energy resolution of 4.4 % FWHM at 662 keV with a 137Cs radiation source. The IC is implemented on a 180nm CMOS process with a total chip size of 100 mm2. Preliminary ASIC results with a CZT detector are presented. An energy resolution of 4.4 % FWHM at 662 keV was obtained with a 137Cs uncollimated point source, which improved up to 3.5 % when the interaction depth was considered.

: http://publica.fraunhofer.de/dokumente/N-264391.html