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Test of a 32-channel Prototype ASIC for Photon Counting Application.

Y Chen¹, Y Cui¹, P O'Connor¹

¹Brookhaven National Laboratory, Upton, NY 11973, USA.

IEEE Nuclear Science Symposium Conference Record. Nuclear Science Symposium

|June 20, 2017

Summary

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A new low-power application-specific integrated circuit (ASIC) for Cadmium Zinc Telluride (CZT) detectors was developed for single-photon emission computed tomography (SPECT). The 32-channel prototype ASIC demonstrates excellent performance with low power consumption and minimal noise.

Area of Science:

Medical Imaging
Detector Electronics
Semiconductor Technology

Background:

Single-photon emission computed tomography (SPECT) requires advanced detector electronics for improved imaging.
Cadmium Zinc Telluride (CZT) detectors offer high-resolution photon detection for SPECT applications.
Low-power, high-performance integrated circuits are crucial for compact and efficient SPECT systems.

Purpose of the Study:

To develop and test a novel low-power application-specific integrated circuit (ASIC) for CZT detectors used in SPECT.
To evaluate the performance characteristics of a 32-channel prototype ASIC, including power consumption, noise, and linearity.
To demonstrate the feasibility of using custom CMOS ASICs for next-generation SPECT systems.

Main Methods:

Keywords:

CZT Multi-channel Photon Counting Test low-power ASIC

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Designed and fabricated a 32-channel prototype ASIC using TSMC 0.35-μm CMOS technology.

Integrated preamplifiers, CR-RC³ shaping circuits, and energy binning with comparators and counters.

Characterized the ASIC's performance, including power consumption, Equivalent Noise Charge (ENC), crosstalk, and Digital-to-Analog Converter (DAC) linearity.

Main Results:

Achieved low power consumption of approximately 1 mW/channel at a 2.5-V supply.
Measured an Equivalent Noise Charge (ENC) of 360 electrons at room temperature with a peaking time of 500 ns.
Demonstrated low crosstalk (<0.3%) and excellent DAC linearity (INL <0.56%, DNL <0.33%).

Conclusions:

The developed 32-channel ASIC is a promising low-power solution for CZT detectors in SPECT.
The measured performance metrics meet the requirements for advanced medical imaging applications.
This work paves the way for more integrated and efficient SPECT systems.