This paper presents an efficient method for the second-order filters with a simulated inductance realized by the Antoniou circuit. The transfer curves of the second-order filters, inclusive of low pass, high pass, band pass, and notch types, are simulated by MATLAB and measured by the spectrum analyzer, and they are analyzable and comparable. Interestingly, because the Antoniou circuit composed of 741s, resistors, and capacitors are intolerant of the non-ideal properties of op amps, the LP, BP, RN, and LPN responses are intangible. It is a key factor. This paper is mainly aimed at this to propose a useful experience and manage to improve it.
