Applications of FTFN/OFA and OMAs in impedance synthesis

Abstract

This chapter presents an overview of the significant contributions made on the realization of gyrators and various other kinds of impedances with particular emphasis on floating inductance simulation for which a specific form of nullor namely the so-called four-terminal-floating-nullor (FTFN) and the operational floating amplifier and somewhat similar appearing element, namely the operational mirrored amplifiers (OMAs) have been found to be particularly versatile. Most of the FTFN-based circuits described in this chapter can be practically implemented using commercially available integrated circuit (IC) current feedback op-amps (CFOAs; such as AD844 from Analog Devices Inc.), while the OMA-based circuits can be implemented with commercially available IC op-amps such as mA741 or LF356 in conjunction with mixed transistor arrays such as CA3096/LM3096.