基于文桥振荡器的T-T滤波器设计

The Design of T-T Filter UsingWen-Bridge Oscillator

对经典文桥振荡器的环路增益分析,将该环路作为T-T滤波器的环路,设计一个带通滤波器,然后通过添加一个积分器设计一个低通滤波器,实现了T-T滤波器的滤波功能。该滤波器仅仅使用2个集成运放,电路不仅拥有低通、带通滤波功能,而且拥有高的Q值,还能实现极点频率和品质因数的正交调节,调节电阻还可产生两路正交正弦信号。通过计算机仿真,证实所设计的电路正确有效。

First,the loop gain of the classic Wen-bridge oscillator is analyzed,and then the loop is used as the loop of the T-T filter.Afterwards,a band-pass filter is designed and then a low-pass filter is designed by adding an integrator to realize the T-T filter.The filter uses only two integrated operational amplifiers.The circuit not only has low-pass and band-pass filtering,but also has a high Q value.It can also realize the orthogonal adjustment of pole frequency and quality factor.Two orthogonal sinusoidal signals can also be generated by adjusting the resistance.The computer simulation proves that the designed circuit is correct and effective.