New Operational Amplifier based Inverse Filters

New first- order and second-order voltage-mode inverse filter circuits employing operational amplifier (opamp) are presented. The first-order inverse low-pass, first-order inverse high-pass and second-order inverse band-pass filter circuits are presented. The op-amp based first-order amplitude equalizer circuit is also presented. The considered inverse filters are checked for functionality using TINA SPICE simulator.