Design and implementation of SOPC-based digital storage oscilloscope

To facilitate the external measurements and maintenance tasks, we proposed an implementation of portable digital storage oscilloscope system, based on programmable chip(System on Programmable Chip) technology. Unlike the traditional design of FPGA for date access process and MCU for display control, the design of portable digital oscilloscope based on SOPC embeds Nios II into FPGA. The embedded system acts as a CPU which controls display of LCD waveform and parameters. In addition, FPGA logical resources are used to design access control module of sampling data and realize trigger access function of that. The practical test results indicate that for the portable digital oscilloscope, the measurement range of signal amplitude is 50 mV~20 V with measuring error less than 4% and the measurement range of frequency is 1 Hz~50 MHz with measuring error less than 2.5%.