基于DSP的微波信号源控制

Control of Microwave Signal Source Based on DSP

为了实现信号源的小型化,便携性,采用DSP芯片TMS320LF2407A利用具有脉宽调制(PWM)功能的引脚,根据芯片资料中控制信号的数学关系式和时钟关系,编程实现输出3路同步时钟控制信号CLOCK,DATA,LE控制AD公司频率合成芯片ADF4156的方法来控制微波信号源的点频扫频等动作。做了示波器测试控制信号,频谱仪测试信号源实验,可以清晰地看到控制信号在时域上的对应关系以及频谱仪中所设置频率信号的功率以及信号在整个频段的移动过程。结果表明输出的控制信号能够精确地使信号源实现点频和扫频功能,具有控制时钟,扫频速度可调,按键控制灵活的特点。

In order to realize the miniaturization and portability of signal source, using DSP TMS320LF2407A with pulse width modulation （PWM） function of the pins to implement the control of microwave signal source. According to mathemati- cal relationship and clock relations, the ADF4156 is controlled by outputting three synchronous clock control signals CLOCK, DATA and LE, so as to control the sweeping frequency of microwave signal source. The experiments about that control signal test using oscillometer and signal source test using spectrum analyzer are performed, whose corresponding relation of the con- trol signal in time domain, the frequency signal＇s power in the frequency spectrum analyzer and the signal movement process in the whole frequency range can be gained. Test results show that the signal source＇s sweeping frequency can be implemented by output control signal. It has characteristics of adjustable sweeping frequency speed and flexible button.