提出一种高阶通用对数滤波器的设计方法。通过分析与利用n阶通用电流模式滤波器的传递函数,建立一种新的系统状态空间表达,使用模块化的结构设计方法,先设计单元模块电路,然后再按一定规则组合成整体电路。设计的整体电路能实现低通、高通、带通和带阻等多种滤波功能,且电路结构简单、易于集成、无源灵敏度很低。Pspice仿真表明,设计方法是可行的。 A high-order general purpose logarithmic filter design method is proposed. By analyzing and using the transfer function of the n-th order universal current mode filter, a new system state space expression is established. Using the modular design method, the circuit of the unit module is designed first, and then the whole circuit is assembled according to certain rules. The design of the overall circuit to achieve low-pass, high-pass, band pass and band-stop filter and other functions, and the circuit structure is simple, easy to integrate, passive low sensitivity. Pspice simulation shows that the design method is feasible.