【应用】ASB提供100M~1GHz增益放大器ASF143用于测距雷达，增益范围19.9~22.7dB

时间： 2023-07-01 来源：世强

技术问答

测距雷达是基于电磁波发射和反射接收来判断距离的测量仪表，按照发射信号种类分为脉冲雷达和调频连续波雷达。其中调频连续波雷达是基于调频连续波的频率差进行测量，发射器和接收器安装在顶部，发射器向外发射经过调制的微波信号，微波信号传播到物体后被反射回接收器，由于时间延迟，发射信号的频率发生改变，通过接受到的反射波与发射波的频率差，计算出雷达波通过的距离。一般来说，调频范围越大测量距离越远，线性度越好，分辨率越高。

某客户测距雷达接收端的应用框图如图1所示。为了解决无线数据传输增益不够的问题，在LNA后需要增加增益放大器：

图1.应用框图

针对客户测距雷达项目中的增益放大器，本文推荐ASB推出的ASF143，具体应用优势如下：

（1）客户测距雷达工作电压在3.3V，接收端工作频率在1GHz以内，ASF143的工作电压在3.3V，工作频率在100M~1GHz，可以满足工作电压和频率要求。

（2）温度范围-40~85℃，结温在150℃，满足工业温度的要求，

（3）工作范围在1.62~5.5V，可以满足绝大部分产品的需求

（4）增益放大器的噪声要做到2.0左右，实现至少22dB增益，1dB压缩输出功率在20dBm，OIP3在35dBm，ASF143的增益在19.9~22.7dB，噪声系数2.0dB以内，可以满足参数要求。

图2. 参数表

综上所述，ASB推出的增益放大器ASF143非常适合用于测距雷达。

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