Active Inductor and Capacitor for DCS receiver band (1.71GHz – 1.785GHz) using multi-MESFET Negative Resistance Circuit

Traditional spiral inductors are usually large, bulky, and difficult to model, hence active inductors look very attractive particularly because of their tuning capability. The basic idea of this design is to realize an active inductor and capacitor that could be used to substitute the spiral inductors and lumped capacitors in Monolithic Microwave Integrated Circuit (MMIC) active filters. The resulting negative resistance serves to compensate the pass-band insertion loss. The benefits of reduced cost, small size and weight justify the effort to develop fully integrated Radio Frequency (RF) and Microwave systems using MMIC technology. In line with this interest, this work will lay a key foundation on which the step toward full integration can be made. For proof of concept, a 5GHz active capacitor using single MESFET negative resistance was designed, simulated and fabricated by GEC F20 Foundry. The test and measurement was done using HP8510 Network Analyzer. The simulated and measured results compared well. Following on this concept, an active inductor for dcs receiver band (1.71GHz – 1.785GHz) using multi-MESFET negative resistance circuit was designed and simulated. The results obtained show constant inductor and negative resistance values within the desired frequency ban