复合信号有源滤波分离电路设计

Filter Design in Multiplex Receiver

油田生产测井中 ,多个井下传感器已调信号用单芯电缆复合后传送到地面接收机 ,再用滤波分离电路分路解调 ,提取传感器信息 ,邻道干扰的大小取决于滤波分离电路的性能。复合信号滤波分离电路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 ,降低邻道干扰。给出了性能分析结果和滤波分离电路设计公式 。

In production of logging of oil field, multiplex signals are transmitted by single cord. The receiver shunts demodulation by useing bandpass filter, and interference depends on performance of bandpass filter. This paper use cascade between bandpass filter and band elimination filter to improves filtering performance, and also presents analysis results and design formula. The practical aplication shows satisfactory results.