New trends in circuit design for analog signal processing

A large number of circuit topologies have been proposed in the literature for analog signal processing such as active filters, oscillators, immittance simulators etc. At the beginning, let´s say until twenty years ago, the researchers were proposing this type circuit topologies without giving any realization circuit and application example. Therefore, the main problem was how to realize these topologies and how to apply them to practical work. Another important missing main factor was the influence of the limitations caused by the realization topologies and employed active elements such as bandwidth, slew-rate, input and output impedances etc. This paper covers the main features combining the circuit design with the actual realization circuit demonstrating several performance limitations on chosen circuit examples.