Speaker
Description
Dark matter and neutrino detection experiments require the digitization of analog signals generated by PMTs or SiPMs. Since the output pulse widths of PMTs and SiPMs are relatively narrow, around tens of nanoseconds, high-quality, high-precision waveform acquisition necessitates a high-speed, high-precision analog-to-digital converter. For example, the Jiangmen Underground Neutrino Observatory (JUNO) uses a 1 GHz sampling rate ADC for PMT outputs. Based on these experimental requirements, a high-speed, high-precision digitization scheme was designed using the 1 GHz, 14-bit commercial ADC, AD9680. An 8-channel high-speed digitization prototype was developed, utilizing a low-noise, high-precision single-ended to differential operational amplifier frontend, achieving an effective number of bits (ENOB) greater than 10. The prototype employs a Kintex-7 FPGA to receive and process the ADC output data, which is then transmitted via four 10Gb optical ports. The hardware, firmware, and software have been fully designed and tested with SiPM and PMT, demonstrating normal operation.
