Title :
Front-end electronics for the readout of CdZnTe sensors
Author :
Moraes, Danielle ; Nygard, Einar ; Rudge, Alan
Author_Institution :
Eur. Organ. for Nucl. Res., CERN, Geneva, Switzerland
Abstract :
The CERN_DxCTA is a front-end ASIC optimized for the readout of CdZnTe sensors. The chip is implemented in 0.25 μm CMOS technology. The circuit consists of 128 channels equipped with a transimpedance amplifier followed by a gain-shaper stage with 20 ns peaking time and two discriminators, allowing two threshold settings. Each discriminator includes a 5-bit trim DAC and is followed by an 18-bit static ripple-counter. The channel architecture is optimized for the detector characteristics in order to achieve the best energy resolution at counting rates of up to 5 M counts/second. Complete evaluation of the circuit is presented using electronic pulses and CdZnTe pixel detectors.
Keywords :
CMOS integrated circuits; application specific integrated circuits; digital-analogue conversion; nuclear electronics; position sensitive particle detectors; readout electronics; semiconductor counters; 0.25 mum; 18 bit; 20 ns; 5 bit; CERN_DxCTA; CMOS; CdZnTe pixel detectors; digital-to-analog converter; front-end ASIC; front-end electronics; gain-shaper stage; static ripple-counter; transimpedance amplifier; CMOS technology; Counting circuits; Electromagnetic wave absorption; Energy resolution; Feedback; Feeds; Parasitic capacitance; Testing; X-ray detection; X-ray detectors;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2005 IEEE
Print_ISBN :
0-7803-9221-3
DOI :
10.1109/NSSMIC.2005.1596268
