本系统以51单片机和FPGA为核心，完成程控放大电路和程控滤波电路，同时设计完成了简易幅频特性测试仪。里面有详细的电路图和设计报告。-The system of 51 single-chip and FPGA as the core to complete the program and program-controlled amplifier filter circuit at the same time to complete the design of amplitude-frequency characteristics of a simple test. There are detailed circuit diagrams and design report.