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本文提出了建立非理想运放等效Z模型的新方法,并以前差及后差映射积分器为例导出了非理想积分器的Z传递函数。利用这种方法,对典型的去耦式双二次二阶带通滤波器进行了计算机模拟及实验验证。所述方法可以推广应用于解决多种类型的高阶开关电容滤波器的设计问题。
In this paper, a new method to establish the equivalent Z model of non-ideal operational amplifier is proposed. The Z transfer function of the non-ideal integrator is derived by taking the former difference and latter difference mapping integrators as an example. Using this method, a typical decoupled biquadratic second-order band-pass filter was simulated by a computer and verified by experiments. The method can be widely applied to solve the design problems of many types of high-order switched capacitor filters.