Research on High Speed Data Acquisition Circuit Based on SCA Technology

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.