An assessment on low-voltage low-power integrated single transistor active inductor design for RF filter applications

In this paper an assessment of bandpass filter implementation based on a single transistor Active Inductor (AI) is presented. A minimum number of components, high linearity, high dynamic range, active inductor is first designed and then used for high frequency bandpass filter. The AI is designed by the use a compensation network that allows to control both the inductance and its series resistance value in the design phase. Analytical formulation is also presented and a simulated IC demonstrator proposed for the filter that has a center frequency of 2000MHz (useful for radio and radar applications) and a 3dB bandwidth of about 6MHz with a quality factor of about 330.