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Fully Field Programmable Gate Array (FPGA)based digitizer for high-resolutiontime and energy measurement is an attractive low cost solution for the readoutelectronics in positron emission computed tomography (PET)detector. In recentyears, the FPGA based time-digital converter (FPGA-TDC) has been widely usedfor time measurement in the commercial PET scanners. Yet, for the energymeasurement, few studies have been reported on a fully FPGA based, largedynamic range and high resolution alternative to the commercial analog-digitalconverter (ADC). Our previous research presents a 25 Ms/s FPGA-TDC basedfree-running ADC (FPGA-ADC), and successfully employed it in the readoutelectronics for PET detector. In this work-in-progress study, by means of thetime-interleaved strategy, a 50 Ms/s FPGA-ADC is presented. With only twooff-chip resistors, both the A/D conversion and energy measurement are achievedon a Xilinx Kintex-7 FPGA. Therefore, this method has great advantagesinimproving system integration. Initial performance tests are also presented,and we hope it can give us a possibility to develop a new FPGA-only front-enddigitizer for PET in future.

The design of a time-interleaved analog-digital conversion modulator based on FPGA-TDC for PET application