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用接到RC网络的负阻抗变换器(NIC)产生的传递函数设计滤波器时,往往假定NIC是理想的。这种假定并不是不可实现的,因为目前已有好几种电路具有接近于理想NIC的特性。 NIC是一种两对端头器件,在理想情况下,其输入阻抗是输出端阻抗的负值。这来源于电流或电压的反相。 NIC使电流方向与无源阻容网络的正常电流方向相反,但又不影响输入和输出电压的极性。例如,如果输出电压E_2和输入电压E_1的极性相同,当电流I_2从负载阻抗为
When designing a filter with the transfer function generated by the negative impedance converter (NIC) connected to the RC network, it is often assumed that the NIC is ideal. This assumption is not unrealistic, as there are already several circuits that have characteristics close to ideal NICs. The NIC is a two-pair head-end device that, ideally, has an input impedance that is a negative value of the output impedance. This comes from the reversal of current or voltage. The NIC directs the current in the opposite direction of the normal current of the passive RC network without affecting the polarity of the input and output voltages. For example, if the output voltage E_2 and the input voltage E_1 have the same polarity, when the current I_2 goes from a load impedance of