2019 Electronic Competition Question E-Internet-based signal transmission system (Xidian University)

This system uses three Pynq Z2 FPGAs as the main control unit to complete the Internet-based signal transmission system. The A and B sending modules perform ADC analog-to-digital conversion at 10MSPS. After framing the signals according to the frequency measurement results, the TCP protocol is used to Gigabit speed enables reliable transmission. After analysis at the receiving end C, the frequency information and clock frequency difference are used for phase compensation, and then DAC digital-to-analog conversion is performed at 10MSPS, and then sent out through a power amplifier composed of a fourth-order Butterworth low-pass filter and THS3091 to meet the load requirements of the question. The test results show that the system can complete the collection and restoration of 0.1Hz~2MHz. For input signals of 1~5Vpp and frequency less than 2MHz, the difference between the output signal amplitude and the input signal amplitude is less than 2%, and the time delay difference is less than 2us, which exceeds the problem. Require.