Waveform digitization time measurement method and system based on SCA

Abstract

The invention discloses a waveform digitization time measurement method and system based on SCA. The measurement method comprises steps of measurement of coarse time, wherein the coarse time is used as a wide-range time unit of the waveform acquired by an SCA, the method for measuring the coarse time comprises steps that a path of clock signal synchronous with a reference clock of an SCA is introduced into a field programmable gate array (FPGA), two clock signals are generated in the FPGA and used for being provided for a pair of counters in the FPGA for coarse time counting, the period of thetwo clock signals is the same as the SCA sampling cycle time, and the phase difference of phases of the two clock signals is set to ensure that the metastable state time of each counter is staggered,and SCA sampling control logic is set in the FPGA, latching of output results of the double counters is performed by using a sampling stop signal of an SCA chip, and a result of one of the double counters is selected according to the sampling stop position number to calculate the coarse time. The method is advantaged in that accurate and wide-range time measurement is realized.

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 ...

Images