PWM (Pulse Width Modulation) signal reference wave recovery system based on FPGA (Field Programmable Gate Array) integrated chip

The invention relates to a PWM (Pulse Width Modulation) signal reference wave recovery system based on an FPGA (Field Programmable Gate Array) integrated chip. The PWM signal reference wave recovery system comprises an FPGA integrated chip unit and a DAC (Digital-to-Analog Converter) module which are connected with each other. The FPGA integrated chip unit comprises an acquisition module, a mapping module, an average value model calculation module, an amplitude conversion module, a cross-clock domain cache module and an SPI communication module which are connected with one another. The acquisition module is used for acquiring a PWM (Pulse Width Modulation) signal, the mapping module is used for mapping the PWM signal into three levels {1, 0,-1}, the average value model calculation module is used for calculating a reference wave amplitude of the mapped three-level signal, the amplitude conversion module is used for converting a data format, and the clock domain crossing cache module is used for synchronizing t