| Summary: | This paper presents a fully differential CMOS active inductor with a cascoded current mirror for 2–5 GHz frequency ranges applications. The proposed active inductor is designed using CMOS 0.18-µm process. The circuit is realized by a fully differential cross-coupled pair of transistors to provide negative feedback for high-quality factor (Q). The cascoded current mirror is employed as a biasing circuit for controlling the current source to vary the negative feedback and tuning the Q factor. Meanwhile, the two resistors at the differential structure help to control the frequency ranges. According to the simulation results, the higher Q factor of 12,580 k with an inductance of 11.4 nH is achieved at 3.6 GHz frequency. The frequency range from 2.6 GHz to 4.4 GHz can be obtained by tuning the value of the resistor. Moreover, it is observed that the supply voltage and current source can be varied to tune the Q factor values from 100 to 900 k. It is proved through a performance comparison with previously published research that the suggested active inductor is appropriate for RF in gigahertz frequency range applications. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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