AGC四路正交信号激励模块设计

Design of incentive module of AGC four quadrature signals

在基于通用检测平台的某型导弹装备距离通道测试中,需要产生四路同步正交信号作为激励。介绍了一种基于NE572芯片的具有自动增益控制(AGC)的四路同步正交信号产生电路,信号频率变换范围为750～6 910Hz。电路结构简单,调整方便。通过实验,由信号发生器模拟通用检测平台输入电路的激励信号,分析了电路输出信号的频率范围、输出幅度波动范围以及输出失真情况,设计完全符合需求,验证了电路的可行性。

In order to produce four in phase quadrature signals as incentive signals in distance channel test of a certain mis- sile based on general test platform, a circuit with automatic gain control（AGC）function is introduced based on NE572 chip. The signal frequency converts from 750 Hz to 6 910 Hz. The circuit is characterized by simple structure and convenient adjustability. The signal generator generates signals of input circuit, and then the frequency range of output signal, the fluctu- ation range of output signal, and output distortion are analyzed. The design meets the needs and the experimental results prove the feasibility of the circuit.