A programmable low-power, low-noise front-end channel in 0.35- µm CMOS for CdZnTe detectors

Diba, Milad and Beilouni, Ahmad and Kalemci, Emrah and Bozkurt, Ayhan (2021) A programmable low-power, low-noise front-end channel in 0.35- µm CMOS for CdZnTe detectors. In: IEEE International Symposium on Circuits and Systems (ISCAS), Daegu, Korea

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A programmable low-power, low-noise readout circuit for Cadmium Zinc Telluride (CdZnTe or CZT) detectors is presented. CdZnTe detectors encompass a wide range of applications such as medical imaging and astrophysics. The front-end comprises a charge-sensitive amplifier (CSA), a programmable reset network with dark current compensation capability, a fifth-order semi-Gaussian filter with pole-zero cancellation, a comparator, and serial interface to communicate with external microcontroller. Utilizing the programmablity of the reset-network, the CSA can provide 256 different discharge time-constants, ranging from 60n to 600µ seconds, making the readout suitable for a wide range of event-rates. The application-specific integrated circuit (ASIC) is designed and simulated in a 0.35- µm 3.3V C35 CMOS process of Austria Micro-Systems. The ASIC has a power consumption of less than 2 mW per channel and the CSA only consumes 260 µW stable with a feedback capacitance of 60 fF which contributes to a conversion gain of 135 mV/fC. Equivalent Noise Charge (ENC) is 98 erms @ 0 pF detector capacitance.
Item Type: Papers in Conference Proceedings
Uncontrolled Keywords: Analog front-end; ASIC; CdZnTe; CZT; Gamma-ray; Low-noise; Low-power; X-ray
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Emrah Kalemci
Date Deposited: 02 Sep 2022 10:55
Last Modified: 02 Sep 2022 10:55
URI: https://research.sabanciuniv.edu/id/eprint/43524

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