【摘要】 设计了一种基于FPGA和自动增益控制技术（AGC）的新型高精度频率测量系统。AGC电路会根据输入信号的幅度值自动调整电路增益,使输出信号稳定在特定值附近。通过等精度测量方法,实现双路正弦波或方波的频率、相位差、占空比等要素的同步测量,其中100 MHz内的正弦波测频相对误差可控制在10^-4内。利用NIOSⅡ软核驱动键盘、液晶屏等外围模块,并添加蓝牙接口,具有较强的实用性。更多还原

【Abstract】 The paper discussed the design of a new frequency measurement system based on FPGA and automatic gain control technology（ AGC） with high accuracy.The AGC circuit can adjust the gain automatically according to the amplitude of input signals,so as to stabilize the amplitude of output signal around a certain value. Through the method of equal frequency measurement,elements such as frequency,phase-difference and duty factor can be measured at the same time.The measuring error of sine wave blow 100 MHz can be controlled in 10^-4.The system uses NIOS Ⅱ kernel to drive peripherals such as keyboard,LCD,bluetooth etc,which all make the system have certain practical significance.更多还原