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有源滤波器的设计,都是将有源器件运算放大器看为理想器件。这样,由于实际运放参数的影响,必然使实际电路与设计电路之间产生误差。因此,设计时如何使运放的特性参数对电路的滤波特性影响最小,就成为一个值得探讨的问题。用运放的宏模型通过灵敏度分析得知,在运放的几个主要性能参数中,运放的开环增益A_d对滤波器传输特性的影响最为显著。所以,设计电路时首先要考虑的是如何使运放增益A_d对滤波器
Active filter design, are the active device op amp as the ideal device. In this way, due to the actual operational parameters, the actual circuit and the design of the circuit will inevitably produce errors. Therefore, how to make the design parameters of the op amp circuit characteristics of the minimum impact on the filter characteristics, it becomes a question worth exploring. With the op amp macro-model through sensitivity analysis, we can see that the open-loop gain A_d of the op amp has the most significant influence on the transmission characteristics of the filter in several key performance parameters of the op amp. So, the first thing to consider when designing the circuit is how to make the op amp gain A_d to the filter