Use of Non-Foster Elements based on Compensated Passive Structure in Tunable Bandpass Filter

Recently, a tunable bandpass filter with active impedance inverter comprising non-Foster negative capacitor based on well-known Linvill's design, has been proposed. Here, we extend this idea by using a non-Foster negative capacitor that comprises compensated passive RL structure. It was found that the new filter had properties similar to the one based on originally proposed approach but with better stability and sensitivity properties.