基于SCA技术的高速数据采集电路研究

Research on High Speed Data Acquisition Circuit Based on SCA Technology

基于开关电容矩阵(Switched Capacitor Array,SCA)的波形数字化技术是未来物理实验装置前端读出电子学的重要发展方向之一。本工作设计了一种基于SCA芯片DRS4(Domino Ring Sampler 4)的超高速波形数字化数据采集电路。DRS4单通道可以最高以5 GHz的采样率对探测器输出信号进行全波形采样。该电路主要由模拟调理电路、DRS4电路、ADC(Analog-to-Digital Converter)电路、FPGA(Field-Programmable Gate Array)、DAC(Digital-to-Analog Converter)电路、触发电路和接口电路等组成。性能测试表明,该电路通道的噪声小于0.5 mV,积分非线性(Integral Non-Linearity,INL)优于1%。本电路模拟输入带宽高,采样率700MHz~5 GHz可调,具有良好的非线性。该数据采集电路具有一定的通用性,适用于多种类型的物理实验装置中的探测器读出。

Waveform digitization technology based on Switched Capacitor Array(SCA)is one of the important development fields of front-end readout electronics for future physical experiment facilities.In this paper,an ultra-high-speed waveform digital data acquisition circuit based on SCA chip DRS4(Domino Ring Sampler 4)is designed.A single channel of the DRS4 can sample the full waveform of the detector output signal at a sampling rate of up to 5 GHz.The circuit is mainly composed of analog conditioning circuit,a DRS4 circuit,ADC(Analog-to-Digital Converter)circuit,FPGA(Field-Programmable Gate Array),DAC(Digital-to-Analog Converter)circuit,a trigger circuit,an interface circuit,etc.Performance tests show that the circuit's noise is less than 0.5 mV,and the Integral Non-Linearity(INL)is better than 1%.In addition,the analog input bandwidth of this circuit is very high,the sampling rate is adjustable from 700 MHz to 5 GHz,and it has good nonlinearity.Therefore,the data acquisition circuit is versatile and suitable for detector readout in various physical experiment facilities.