"STM32F103ZET6核心板简易频率特性测试仪设计与实现"

pass filter and other functional modules. The testing data includes amplitude-frequency characteristics and phase-frequency characteristics of the signal, which are displayed on the color TFT screen. This system utilizes a high-speed DDS (AD9854) module to generate signals, capable of outputting orthogonal signals with controllable amplitude and frequency. The RLC network uses a series resonant circuit to achieve the required center frequency of the network passband. The orthogonal signals generated by DDS and the signals from the RLC network are multiplied by the multiplier AD835 module, filtered through LTC1564 low-pass filter, sampled by the on-chip AD converter on the microcontroller, and finally displayed on the color screen, completing a simple test of the signal's amplitude and phase frequency. Keywords: STM32; DDS; multiplier; filtering; TFT.