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对一给定的传递函数,我们可以采用经典的合成技术并用无源的RLC组合来获得它的方程式。但是,如果要求不使用电感器的话,则必须使用有源器件。迴转器和负阻抗变换器(下面用缩写字NIC表示负阻抗变换器)就是两个这样的有源器件。 NIC是一个两对端头器件(见图1),其工作原理是:于一端接一个阻抗,在另一端以其负阻抗的形式出现。例如,如果负载是一个电阻,这时输入端表现为一个负电阻。这就意味着,耦合到NIC的阻容电路可以做成集成电路的形式,它在低频时的Q值
For a given transfer function, we can use classical synthesis techniques and use a passive RLC combination to obtain its equations. However, active devices must be used if no inductors are required. The gyrator and the negative impedance converter (hereinafter referred to as the minus impedance NIC) represent two such active devices. The NIC is a two-pair termination device (see Figure 1) that works by connecting one impedance at one end and its negative impedance at the other. For example, if the load is a resistor, then the input behaves as a negative resistor. This means that the RC circuit coupled to the NIC can be made in the form of an integrated circuit whose Q value at low frequencies