【摘要】 以传统的双调谐带通滤波器为原型,先利用CCCⅡ设计出V-I变换器、模拟电阻、接地和浮地模拟电感,再用这些基本电路模块分别代替滤波器原型中的端接电阻、接地和浮地电感等,从而设计出了电控双调谐四阶电流模式带通滤波器。讨论了弱耦合、强耦合和临界耦合三种现象。在临界耦合条件下,滤波器的中心频率为10.916080MHz,3dB带宽为2.828MHz。电路的参数可电控调谐,所有电容接地,没有无源电阻,因而适宜集成。计算机仿真与理论分析一致。更多还原

【Abstract】 On the basis of traditional band-pass filter with coupled tunability, the basic cercuit modes of a V-I coverter, a analog resistor, a earthed and a floating-earthed analog inductance were all given by CCCⅡ. The terminal resistor, the earthed and the floating-earthed inductance etc in the prototype of filter were substituted by the basic circuit modes. Forth-order current-mode band-pass filter with coupled tunability by current using CCCⅡ was realized, and weak coupling, strong coupling and critical coupling were discussed. The center frequency of the filter is 10.916 080 MHz and the 3 dB bandwidth is 2.828 MHz under critical coupling. The circuit parameters can be tuned by external bias current of CCCⅡ, and capacitors are all earthed, there is no passive resistor, which make it suitable for VLSI technology. Computer simulating results are consistent with theoretical analysis.更多还原