Reconfigurable of current-mode differentiator and integrator based-on current conveyor transconductance amplifiers

The reconfigurable of the differentiator and integrator based on current conveyor transconductance amplifiers (CCTAs) have been presented in this paper. The proposed configurations are provided with two CCTAs and grounded elements. The configurations can be operated in the differentiator and integrator by selecting external passive elements. The input and output currents have low and high impedances, respectively; therefore, the configurations can be cascaded without additional current buffer. The proposed configurations can be electronically tuned by external direct current (DC) bias currents, and it also has slight fluctuation with temperature. An application of universal filter is demonstrated to confirm the ability of the proposed configurations. The results of simulation with Pspice program are accordance with the theoretical analysis.

A Current Mode Universal Filter and a Single Resistance Controlled Oscillator Employing only Grounded Passive Elements: Applications of VDCC

This research article explores the possible applications of voltage differencing current conveyor (VDCC), as a current mode universal filter and a sinusoidal oscillator. Without the need for an additional active/passive element, a very simple hardware modification makes it a dual-mode quadrature oscillator from the filter configuration. Both the proposed circuit requires only two VDCC and all grounded passive elements, hence a preferable choice for integration. The filter has some desirable features such as availability of all five explicit outputs, independent tunability of filter parameters. Availability of explicit quadrature current outputs, independence in start and frequency of oscillations, makes it a better oscillator design. Apart from prevalent CMOS simulation results, VDCC is also realized and experimentally tested using the off-the-shelf integrated circuit. All the pen and paper analysis such as non-ideal, sensitivity and parasitic analysis supports the design.

Compact Charge-Controlled Memristance Simulator with Electronic/Resistive Tunability

The work endeavors to realize a single Voltage Differencing Current Conveyor (VDCC)-based current-controlled memristor emulator with charge-dependent linear memristance function. Such current-controlled memristors closely model the current ([Formula: see text])–voltage ([Formula: see text]) relationship of the popular TiO2-based physical memristor architecture constructed by Hewlett–Packard (HP). The presented emulator circuit comprises only two grounded passive elements and two external MOS transistors along with a VDCC active element and provides the facility of electronic/resistive tunability. It is found through the detailed literature survey that the presented circuit is the most compact design to realize a charge-controlled memristance simulator as compared to any previously reported structure. The designed configuration has been verified through presented simulation results generated using PSPICE based on 0.18[Formula: see text][Formula: see text]m CMOS technology. It has also been validated through relaxation and chaotic oscillators developed using the proposed VDCC-based memristor emulator and output waveforms have been shown. Furthermore, the discussed memristor emulator has been implemented and verified through commercial ICs, AD844 and LM13700.

CMOS Realizable and Highly Cascadable Structures of First-Order All-Pass Filters

Two novel resistorless structures of a first-order voltage-mode all-pass filter are presented in the paper. Both the structures employ a fully differential second-generation current conveyor (FDCCII) as the primary active element, in addition to an active resistor. A grounded capacitor is the only passive component used in both the structures. In both the structures, CMOS realization of FDCCII is utilized; hence, these structures are CMOS compatible. Some of the other highly demanded features possessed by the presented all-pass structures are: a simple circuit topology, electronic tunability, high input impedance, constraint-free operation in terms of passive component matching, and low sensitivity figures. The theoretical performances under ideal and non-ideal scenarios are presented in detail. Furthermore, the proposed idea is extended to an Nth-order voltage-mode all-pass filter and a quadrature oscillator to explore some of the possible applications. PSPICE simulation results verify the theoretical claims of the presented all-pass filters. HIGHLIGHTS Two novel resistorless structures of first-order all-pass filters based on fully differential second-generation current conveyor are presented Performance of the proposed structures are thoroughly described in ideal and non-ideal scenarios Theoretically described details of the proposed structures are verified by carrying simulations on PSPICE using 180 nm CMOS technology An Nth-order all-pass filter and a quadrature oscillator are also presented as applications GRAPHICAL ABSTRACT

New Electronically/Resistively Tunable Floating Emulators to Realize Memristor and Inverse Memristor

This article presents the architectures of two emulator circuits, which realize the behaviour of a floating memristor and inverse memristor respectively. Both the presented emulator circuits are based on modified Voltage Differencing Current Conveyor (MVDCC) and grounded passive elements only. The feature of Electronic/Resistance tunability is found in both the emulator circuits. Furthermore, no employment of any external multiplier circuitry can be viewed as an important advantage of the proposed emulators. Also, the utility of the inverse memristor has also been discussed in theoretical discussions. The simulations have been performed to verify the working of all the presented emulator circuits, under PSPICE environment. Moreover, these MVDCC based emulators are also designed using commercially available ICs, LM13700 and AD844.