Synthesis of a second order band-stop filter

This paper discusses an innovative strategy for implementing a band-stop filter. The proposed band-stop filter is designed using minimally invasive filter architecture with an active inductor. The transfer function of invasive filter is based on the impedance ratio; therefore, the filter type can be determined by choosing the grounding impedance at input terminal of the inverting amplifier. In order to design a band-stop filter, it is essential to integrate an inductor into the impedance framework. This inductor plays a crucial role in the overall functionality of the filter. Moreover, the use of an active inductor is particularly advantageous as it not only helps to conserve space within the circuit but also provides the flexibility for tunability, allowing for adjustments to the filter’s performance as needed. The proposed filter was validated through both simulation and experimental results. The results of the simulation indicate that the proposed filter consumes 2.86 mW from 1.8 V power supply, achieving 2.1 MHz center frequency with 430 KHz bandwidth. The integrated noise is 162.56 μV from 100 KHz to 10 MHz. It achieves an in-band IIP3 of 13.7 dBm. While, the discrete components were used to obtain the experimental results, achieving 2.5 KHz with 26.25 dB attenuation and 1.1 KHz bandwidth.