Multi-channel Waveform Digitization System Utilizing Switched Capacitor Array ASICs

Switched Capacitor Arrays (SCAs) can be employed to achieve high speed waveform digitization. In this paper, we designed an 8-channel 2 Gsps waveform digitization module using four SCA chips named FEL_SCA which was designed in our laboratory. In this module, we used a FPGA device for data readout and circuit configuration. Besides, a 128 Mb SDRAM and USB interface were integrated in this module. We have also conducted DC voltage tests, transient tests and bandwidth tests on this module. The results indicate that in the signal voltage range 100 mV~1 V, the INL is better than 1%, the RMS noise is about 1.76 mV and the -3 dB input bandwidth is 450 MHz.