This research paper reports a novel design for third order chaotic and hyperchaotic oscillator with cubic nonlinearity using single operational trans-resistance amplifier (OTRA) and few passive elements. The key nonlinear dynamical characteristics in terms of sensitivity, divergence, equilibrium point and Lyapunov exponent are recorded in this literature. The operational activity of the proposed oscillator based on OTRA is integrated using 0.25 µm TSMC CMOS parameter. For the generation of hyperchaotic oscillator, an external capacitor is added to the third order chaotic oscillator. To justify the theoretical nonlinear dynamics of proposed chaotic oscillator, PSPICE simulation by using CMOS based OTRA and experimental investigation using IC AD844 based OTRA are well implemented.

An autonomous chaotic and hyperchaotic oscillator using OTRA

Precision instrumentation amplifiers and read-out integrated circuits / Rong Wu, Johan H. Huijsing, Kofi A.A. Makinwa

This article is objected to present a new fully/electronically controllable voltage-mode Schmitt trigger based on a modified voltage differencing gain amplifier (VDGA). It can offer both counterclockwise (CCW) and clockwise (CW) functions, without changing circuit topology. The proposed Schmitt trigger comprises merely one VDGA and three resistors. The hysteresis and amplitude of the output voltage of proposed Schmitt trigger can be independently controlled by corresponding bias currents of the VDGA. The modified VDGA was designed by a fully balanced differential transconductance technique based on 0.35 µm CMOS transistor technology, providing advantages in high gain, wide range of adjustability and symmetrical output signals. The performances of proposed Schmitt trigger were deeply investigated by not only simulation via PSpice program, but also experimental setup using commercially available integrated circuits. Both results agree well with the theoretical anticipation and are consistent each other. The total power consumption is approximately 1.39 mW at ± 1.5 V power supply. Additionally, to prove the practical use-abilities of the proposed Schmitt trigger, its applications in a voltage-mode relaxation oscillator, a triangular/square wave generator and a pulse width modulator are also included.

A fully/electronically controllable voltage-mode Schmitt trigger based on only single VDGA and its applications

This paper presents electronically tunable Schmitt trigger circuit based on voltage differencing gain amplifier (VDGA). The circuit comprises only 1 VDGA without any passive element. The threshold and output voltage levels of the proposed Schmitt trigger can be independently controlled by corresponding bias currents of the VDGA. The performance verification of proposed Schmitt trigger is depicted by PSpice simulation program with the model parameter 0.35μm CMOS process. The obtained results confirm the theoretical expectation. The total power consumption approximately 0.25mW, at ±1.5V. This proposed Schmitt trigger can further be used in control systems and signal generators.

An Independently/Electronically Controllable Schmitt Trigger Using only Single VDGA

A robust square wave generator employing a sole capacitor and two resistors has been presented in this study. Low power as well as popular translinear circuit scheme of Second generation current controlled current conveyor-CCCII has been taken as an active element to implement the proposed square wave generator. CCCII inhibits promising features like availability of three mutually independently and electronically adjustable parameters corresponding transconductance (gm), intrinsic resistance (r) of the current input terminal and current gain between two terminals) that are very prevalent for control applications accepted currently. The operating frequency of the proposed model has been analyzed with respect to the passive components present there, with no exposure of output signals to the thermal voltage (VT). Electrical/Device properties (like Noise, Threshold, area etc.) of the proposed circuit have also been discussed in this work. The simulation work was carried out on Synopsis Hspice tool (v-2008.03) from Avant. Satisfying results with anticipation of theoretical and simulated results, including precision (consistency assessment) with Pareto analysis (Ist order Best Test flavored by Decision making analysis) were observed during the study. The 45 nm BSIM CMOS modelling parameters were adopted to prove the theory. The elementary purpose of using such parameters is to maximize the circuit drive and lowering the leakage current. Another purpose of using these modelling parameters is to enhance the realization of the proposed circuit in the form of chip die and further get it fabricated in custom Integrated circuit(IC) form, from a Standard local foundry. Maximum power consumption of the circuit is 600 µW, with ± 1 V rail to rail operating voltages.

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A novel square wave generator based on the translinear circuit scheme of second generation current controlled current conveyor-CCCII

In this research paper, a simple clock wise and counter clock wise Schmitt trigger employing single four terminal floating nullor (FTFN) with two external resistors is presented. The proposed Schmitt trigger avails CMOS based FTFN and it is extended for the application as a square and triangular wave generator, by adding an external capacitor to it. In addition, the proposed waveform generator provides independent tunability of amplitude of square wave by implementing the passive resistors using MOS transistors which make the circuit to be integrated fully. Finally, the verification of the proposed design is verified using PSPICE to justify the theoretical analysis. Also, post layout simulation and the experimental verification using commercially available current feedback operational amplifier named as ICAD844 based implementation for FTFN are included to confirm the reliability of the circuit.

A novel Schmitt trigger and its application using a single four terminal floating nullor (FTFN)

This research paper brings an instrumentation amplifier (IA) that exhibits all possible mode specifically voltage, current, transadmittance, and transimpedance mode using a single differential volt...

A Novel Differential Voltage Current Conveyor (DVCC) Based Instrumentation Amplifier

In this research paper, a simple Instrumentation Amplifier (IA) which can operate in voltage and transadmittance modes employing a sole Differential Voltage Current Conveyor Transconductance Amplifier (DVCCTA) with only one grounded resistor is presented. Both the modes are concurrently given within the same circuit topology and also avails the feature of IC integration. In addition, the proposed topologies provide a wide range of differential gain bandwidth and CMRR bandwidth of about (1.05 GHz, 17.286 MHz) for transadmittance mode, (1.02GHz, 17.286 MHz) for voltage mode respectively. Furthermore, the proposed design has an appealing feature of electronic tuning of differential gains via bias current (IB). CMOS based DVCCTA is used to authenticate the workableness of the proposed designs through PSPICE with 0.18 μm TSMC CMOS technology parameter. The performance of the proposed topologies is evaluated in terms of non-ideal analysis, Monte Carlo simulations and temperature dependent variations. The simulated responses correlate with the theoretical prediction.

Realization of Electronically Controllable, Wide bandwidth Instrumentation Amplifier using single DVCCTA

This study presents a unique approach to the Voltage mode Instrumentation Amplifier (IA) design. The proposed design utilizes a single Differential Voltage Current Conveyor Transconductance Amplifier (DVCCTA) in conjunction with two external grounded resistors. The suggested design incorporates the feature of IC integration due to its grounded passive elements. A further appealing feature of this design is the ability to electronically adjust the differential gains through bias current (IB). Additionally, the proposed topology offers a broad range of CMRR and differential gain bandwidth. To check the feasibility of the proposed design, PSPICE simulations are conducted using 0.18 µm TSMC CMOS technology parameters and CMOS-based DVCCTA. The circuit’s performance is assessed through Monte Carlo simulations, considering temperature related variations, and non-ideal analysis. The obtained results are then compared with previously reported structures in the existing literature.

Harika Pamu

Papers

A novel Schmitt trigger and its application using a single four terminal floating nullor (FTFN)

A Novel Differential Voltage Current Conveyor (DVCC) Based Instrumentation Amplifier

Realization of Electronically Controllable, Wide bandwidth Instrumentation Amplifier using single DVCCTA

A novel DVCCTA based Electronically tunable Instrumentation Amplifier