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在一般滤波器设计中,由于电抗元件合含有不可避免的损耗,或多或少影响了电路的选择性。在无互感电路中增益常数要受到一定限制。在低频工作范围,往往要求电路中尽量避免电感线圈的使用,但仅用RC元件又不能满足网络自然频率有复值的要求。应用有源网络这些限制就不再是必要,这些困难也可以得到克服。并且综合的步骤和网络结构也可以得到到简化。当然有源元件的价格较高,需要电源和维护,以及它的特性容易受到外部环境的影响等是有源网络的缺点。但由于半导体技术的迅速发展,网络综合理论的逐步提高,这些缺点正
In the general filter design, because the reactance components together contain the inevitable loss, more or less affected the circuit selectivity. In non-mutual inductance circuit gain constant to be subject to certain restrictions. In the low-frequency operating range, often require the circuit to avoid the use of inductors, but only with RC components can not meet the natural frequency of the network complex value requirements. These restrictions on the use of active networks are no longer necessary and these difficulties can be overcome. And the integrated steps and network structure can also be simplified. Of course, the high price of active components, the need for power and maintenance, and its characteristics vulnerable to the external environment are the disadvantages of active networks. However, due to the rapid development of semiconductor technology and the gradual increase of network synthesis theory, these shortcomings are positive