Waveform digital time measurement method and system based on sca

Abstract

The invention discloses a waveform digital time measurement method and system based on SCA. The measurement method includes: measuring the coarse time, the coarse time is used as a large-scale time unit of the waveform collected by the SCA, and the method of measuring the coarse time includes: on-site A clock signal synchronized with the SCA reference clock is introduced into the programmable gate array (FPGA), and two clock signals are generated in the FPGA to provide a pair of counters in the FPGA for coarse time counting. The two clocks The period of the signal is the same as the SCA sampling cycle time, and the phase difference of the two clock signal phases is set to ensure that the metastable time of each counter is staggered; and the SCA sampling control logic is set in the FPGA, and the sampling stop signal lock of the SCA chip is used. Store the output result of the dual counter, and select the result of one of the dual counters according to the sampling stop position number to calculate the rough time. The method and system realize accurate and large-range time measurement.

Description

technical field [0001] The disclosure belongs to the technical field of waveform digitization electronics, and relates to a method and system for measuring waveform digitization time based on SCA. Background technique [0002] Waveform digitization technology is one of the very important development trends of front-end electronics in particle physics experiments in the future. Experimenters can obtain all the physical information carried by detector waveforms. figure 1 It is a schematic diagram of the process of obtaining signal information by using waveform digitization technology in the prior art. Such as figure 1 As shown, the detector output waveform is digitized and converted into waveform data, and the time information carried by the waveform can be obtained by fitting, interpolating and screening the waveform data. [0003] The traditional waveform digitization technology route based on Analog-to-Digital Converter (ADC, Analog-to-Digital Converter) not only has low ...

AI Technical Summary

Problems solved by technology

However, the existing waveform digitization scheme needs to sample and quantize all the time intervals between the A and B waveforms, which consumes a lot of storage resources

For the SCA chip, its sampling depth is limited, and it cannot complete long-term continuous sampling and quantization. Therefore, it is very difficult to realize a long-term measurement range with a large time interval, especially for multiple intervals in a single frame of the sampling waveform. In the case of an open probe signal

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