CFOAs in Analog Integrated Filter Design

In this manuscript various structures of Analog filters are described and built using as basic active element the Current Feedback Operational Amplifier. Firstly, the fundamental circuits used for carrying out operations on signals are described. Specifically, the properties, the symbol, the advantages and the characteristics of the current feedback operational amplifier are explained at the beginning. The circuit of the current feedback operational amplifier helps us to design lossy and lossless integrators as well as summation-subtraction circuits. We proceed to high-order filters employing the Leapfrog method, with the simulator of an inductor and finally with the wave equivalent using current feedback operational amplifiers. Some applications of the Current Feedback operational Amplifiers are presented, while examples of HSPICE program files for the circuits, which are designed, are provided.