Prototype of a Digitizer Module Based on Multicycle-Encoding FPGA ADC for a Small Animal PET
JOURNAL OF INSTRUMENTATION(2023)
摘要
Current research in small animal positron emission tomography (PET) scanners focus on obtaining better spatial resolution and higher sensitivity. These enhancements of scanner performance result in a corresponding increase in the complexity of the electronics, which usually manifests through an increase in the number of electronics channels. Analog-to-digital converters (ADCs) implemented in field programmable gate arrays (FPGAs) are an effective way to simplify electronics complexity. In this paper, a resource-saving multicycle-encoding structure of an FPGA-based ADC with automated calibration is proposed, which achieves a sampling rate of 250 Msps. A digitizer module prototype containing 64 charge measurement channels based on the FPGA ADC is designed using a Kintex-7 FPGA. The effective number of bits (ENOB) achieved using the FPGA ADC is 4.26 bits under a 10.0555 MHz sine wave input. The charge measurement resolution of each channel is better than 5 parts per thousand full width half maximum under a 0.8 V signal input and 3% under inputs in the range 0.1 V to 1.2 V. The integral nonlinearity of each channel is within +/- 1%.
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关键词
Analogue electronic circuits,Digital electronic circuits,Front-end electronics for detector readout,Gamma camera, SPECT, PET PET/CT, coronary CT angiography (CTA)
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