中文摘要：

为了实现结构简单且截止频率可调的多功能N阶电流模式滤波器，提出了一种多输入单输出多功能N阶CCCⅡ（电流控制第二代电流传输器）-C（电容）电流模式滤波器的设计方法．该方法利用信号流图理论构造出N阶多输入单输出电流模式滤波器的信号流图，再根据信号流图综合出滤波器电路．用该方法可以实现出N阶低通、带通、高通及带阻电流模式滤波器．N阶滤波器电路仅由N个CCCⅡ，N个电容及一个多端输出的电流镜构成，且电路中的CCcⅡ仅为CCCⅡ＋（同相CCCⅡ）而无CCCⅡ-（反相CCCⅡ）．通过改变CCCⅡ的外接直流偏置电流可以调节滤波器的截止频率．另外，用该方法所设计的电路参数仅由标准传递函数分母的两项系数之比决定，最后对截止频率为100kHz的四阶巴特沃斯滤波器进行了仿真。验证了该方法及电路的正确性．

英文摘要：

In order to realize multiple-input and single-output Nth-order current mode multifunction filters with simple structure and adjustable cutoff frequency, a design method of multiple-input single-output multifunction Nth-order CCCⅡ （current controlled second generation current conveyor）-C（capacitor） current mode filters was proposed. The idea of the method was that signal flow graph corresponding to Nth-order multiple-input single-output current mode filters was constructed by signal flow graph theory. The filtering circuits were synthesized on the basis of the signal flow graph. Using this method, Nth-order lowpass, bandpass, high-pass and bandstop current mode filters could be easily realized. A Nth-order filter circuit was constructed by N CCCⅡ s, N capacitors and one current mirror with multiple outputs. Moreover, the every CCCⅡ in the circuit was all CCCⅡ ＋ （non-inverting CCCⅡ ） , and not CCCⅡ -（ inverting CCCⅡ）. The cutoff frequency of the filter could be adjusted by varying the external bias currents of CCCⅡ s. in addtion, circuit parameters were determined by the rate of two coefficients in the denominator of standard transfer function. Lastly, the simulation to fourth-order butterworth filter with 100 kHz cutoff frequency was made to validate the design method and the circuits.