High-speed electronics system with timing and amplitude signal acquisition design for multi-channel CdZnTe Array Detector

Abstract

This paper presents a High-Speed Electronics System with Timing and Amplitude Signal Acquisition Design for Multi-channel Cadmium Zinc Telluride (CdZnTe) Array Detector. The readout channel comprises preamplifiers, post-amplification stages, peak hold and detection circuits, a multiplexer, an analog-to-digital converter (ADC), time-to-digital converters (TDC), and calibration circuits. In circuit design, a differential voltage amplifier (DVA) is used as the preamplifier in order to achieve similar performance to that of the Charge Sensitive Amplifier (CSA) while decreasing the design cost and complexity, and the peak hold circuit employs a Schottky diode with RC to achieve a high signal throughput. The results of the tests demonstrate that the typical signal output from the CdZnTe detector is within 10 ns of the rising edge after amplification and has a signal throughput rate of 1 MCPS. The system was irradiated using an X-ray Generator with a pulse width of 50 ns, and the resulting 9-channel envelope half-width is at 40.5 ns, which is in line with the actual pulse width.