多通道复接信号接收机滤波器的设计

Filter design in multiplex receiver.

油井生产测试中 ,多个井下传感器信号复接后 ,用单芯电缆传送到地面接收机 ,再用带通滤波器分路解调 ,提取传感器信息 ,邻道干扰的大小取决于带通滤波器的性能。开发设计的多通道复接信号接收机带通滤波器采用带阻滤波器和带通滤波器前后级联 ,可以降低对过渡带的需求 ,提高阻带衰减 ,降低邻道串扰。文章给出了分析结果和接收机带通滤波器设计公式 。

In production logging of oil field,multiplex signals are transimatted by single-cord,The receiver shunts demodulation by use of bandpass filter, interference depends on performance of bandpass filter. This paper employs cascade between bandpass filter and band-elimination filter, improves filtering performance. The paper presents analysis results and design formula.The practice use shows satisfactroy results.