Design and analysis of floating inductance simulators using VDDDAs and their applications

Abstract

This contribution introduces the design of new electronically controllable floating inductance simulators including lossless inductor, parallel resistor-inductor and series resistor-inductor circuits. The proposed simulators consist of two voltage differencing differential difference amplifiers (VDDDAs) as active function block with one resistor and one grounded capacitor. For real practical test and cheap cost, the VDDDA employed in this paper is constructed from commercially available ICs. The proposed active inductors don’t require any critical matching condition of passive element. If second port of the proposed inductors is assigned as output voltage, it can be simply adapted to achieve low impedance output voltage node with unity or double gain amplifier which is beneficial feature. Moreover, the third order low-pass and fourth order band-pass ladder filters are designed using proposed simulators. Low impedance output voltage node and double output voltage gain of ladder filters with electronic controllability of pass-band frequency are obtained. The performances of the presented simulator circuits and ladder filters are tested by Pspice simulation and experiment using VDDDA constructed from ICs, AD830 and LM13700. The simulation and experimental results confirm with theoretical behavior. Moreover, the recommended design for chip implementation to reduce number of VDDDA is included. The recommended lossless inductor, parallel resistor-inductor and series resistor-inductor circuits consist of single VDDDA which contains plus and minus z terminals along with single resistor and single grounded capacitor.