並列摘要
Owing to the advance of fabrication technique, size reduction of electronic device has progressed steadfastly. However, the commonly used spiral inductor usually occupied a large portion of the chip area, which made the miniaturization of high frequency circuit system difficult. An active inductor is constructed from some active devices, such as field effect transistor (FET). The inductive property is derived from the interaction between the interpolar capacitance and the induced current effect. In this article, we have presented three different circuit configurations to achieve different circuit characteristics. These configurations can be utilized in different high frequency filters. From the characteristics of the circuits, we have found ground for further improvement for applicability of high quality inductive circuit.