design of band-pass filter based on active capacitance circuit and tunability with neural network

in this research, active capacitance circuit and the feature of negative resistance are analysed in details. also, a new active filter is presented based on active capacitance circuit. for simulations, we used matlab and advanced design system(ads). proposed active filter (rf) is a narrow band filter. the results of simulation shows some aspects of sustainability and low noise feature. the circuit has negative resistance at frequency range of 2-7 ghz, in which negative resistance is adjusted with neural network. the central frequency is 5.50 ghz, and band width is 278mhz. in the central frequency the gain is 1 db and quality factor(q) is 24. the number of active filter noise in central frequency is 1.51db db. the results from regulations with neural network has an error less than 1% in central frequency.