双T网络的频率特性分析

双T网络由于具有良好的滤波特性和选频特性，常在电子测量仪器的滤波电路或振荡电路中用作滤波网络或选频网络。但在近几年出版的“模拟电子技术”类科教书中对双T网络有关特性均未详细讨论，以致在实验过程中学员对双T网络的不理解，故本文对双T网络的频率特性及其在电子线路中的应用进行分析，供教师和学员参考。

Double T Filter and Its Frequency Characteristic

Double T filter is usually used as filtering and selecting circuits in electronic measuring instruments and equipments. this paper presents the circuit structure of double T filter and analyzes its frequency characteristics. The analysis results show that double T filter has well filtering and selecting characteristics. The applications of double T filter in reality are also introduced briefly.