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

 
: Voelker, Matthias; Hauer, Johann; Benlloch, Jose Maria; Soriano-Asensi, Antonio; Sánchez, Filomeno; Carrascal, Jorge; Cela, Jose-Manuel; Romero, Luciano

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Microelectronics journal 45 (2014), Nr.10, S.1275-1280
ISSN: 0026-2692
ISSN: 0959-8324
Englisch
Zeitschriftenaufsatz
Fraunhofer IIS ()

Abstract
A 144 channel measurement IC for CdZnTe detectors, used for PET, is presented. Each channel consists of a charge sensitive amplifier, a fast and a slow 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 CdZnTe detector yielded an energy resolution of 4.4% full width half maximum at 662 keV with a 137Cs radiation source. The IC is implemented on a 180 nm CMOS process with a total chip size of 100 mm2.

: http://publica.fraunhofer.de/dokumente/N-291422.html