To provide an active inductor circuit capable of suppressing waveform distortion when the input impedance of each of two terminals for external connection is equally applied to a differential circuit, thus reducing an area and reducing power consumption.
Four active circuits 1A-1D in which an input of one of first voltage controlled current source circuits 5A-5D and second voltage controlled current source circuits 6A-6D of different polarities of mutual conductance and an output of the other, and an input of the other and an output of the one are connected to each other are connected in circulation, a capacitor 4 is connected between an opposing pair of four connection points of the respective active circuits and the other opposing pair is configured as a terminal pair Nx1 and Nx2 for the external connection.
FUJII NOBUO
TAKAGI SHIGETAKA
SATO TAKAHIDE
TOKYO INST TECH