基于AD9954芯片的非线性调频信号实现

Nonlinear FM Signal Generator Based on AD9954

提出了一种基于新型直接式数字合成(DDS)AD9954芯片,用数字阶梯逼近法直接读取数据产生非线性调频(NLFM)信号的方法。介绍了NLFM信号的实现、PIC控制电路与接口,分析了方法的不足。研究表明,该法所用硬件资源少,适于小时宽频宽乘积的非线性调频脉冲信号的实现。

A method to produce nonlinear frequency modulation （NLFM） signal by using digital step approaching to read data directly based on AD9954 chip was put forward in this paper. The forming of the NLFM signal, and PIC control circuit and interface were introduced. The shortages of the generator were also analyzed. The analysis showed that the hardware used in this method was simple. The generator was suitable to produce NLFM signal with small product of time and frequency.