Novel Reconnection-Less Reconfigurable Filter Design Based on Unknown Nodal Voltages Method and Its Fractional-Order Counterpart

Abstract

A novel solution of reconnection-less electronically reconfigurable filter is introduced in the paper. The filter is designed based on unknown nodal voltages method (MUNV) using operational transconductance amplifiers (OTAs) and variable gain amplifier (VGA). The structure can provide all-pass, band-stop, high-pass 2nd order functions, high-pass function of the 1st order and direct transfer from the same topology without requirement of manual reconnection. The proposed structure also offers the electronic control of the pole frequency. Moreover, fractional-order design of the proposed filter is also provided. The behaviour is verified by simulations using Cadence IC6 (spectre) software.

Reconnection-Less Reconfigurable Filter Based on Method of Unknown Nodal Voltages Using 4×4 Matrix

“…The solution of the above-described problem is the utilization of so-called reconnection-less reconfigurable (switchless) filters [12], [13], [14], [15], [16], [17], [18], [19], [20], [21] where the change of the transfer functions does not require any switching or topological changes. The general concept comes from the frequency filters operating in the microwave systems [12], [13], [14], [15] where the reconfiguration of the transfer function has its origin in the electromagnetic coupling of elements.…”

Reconnection–less Reconfigurable Fractional–Order Current–Mode Integrator Design With Simple Control

“…Fractional-order systems have found their application in diverse industry branches such as medicine [1,2], modeling and measurement of various signals [3][4][5], agriculture [6], car industry [7], etc. In case of the electrical engineering, the utilization of FO calculus covers circuits filtering the spectrum [8][9][10][11][12][13][14][15][16][17], FO oscillators [18][19][20][21][22][23] and other circuits with fractional-order characteristics [24][25][26][27][28][29], which then can be implemented and find their purpose in applications of above-mentioned industry areas.…”

“…This approach has disadvantages of commercial unavailability of these realizations and the absence of the electronic control of the resulting order. The next approach involves the substitution of the FOE by RC ladder networks [11,[13][14][15][16][17]. RC structures offer the possibility of simple design due to the commercial availability of building elements (only require common capacitors and resistors).…”

Dual-Mode Multifunctional Reconnection-Less Reconfigurable Filter

“…Reconnection-less reconfigurable filters [11]- [17] bring a possible solution to the above-mentioned problem as the resulting output response is set through the electronically controllable elements, which are usually controlled by DC current or DC voltage, which can be externally applied to the chip. To the best of author's knowledge, there has been no report of a reconnection-less reconfigurable filter offering its functions in multiple operational modes.…”