INDUCTORLESS REALIZATION OF NONAUTONOMOUS MLC CHAOTIC CIRCUIT USING CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS

2005 ◽  
Vol 14 (01) ◽  
pp. 99-107 ◽  
Author(s):  
UǦUR ÇAM ◽  
RECAİ KILIÇ
Keyword(s):  
Secure Communication ◽  
Communication Systems ◽  
Operational Amplifiers ◽  
Chaotic Circuit ◽  
Current Feedback ◽  
Nonlinear Resistor ◽  
Current Feedback Operational Amplifiers ◽  
Chaotic Signals ◽  
Circuit Structure ◽  
Floating Inductance

An inductorless realization of nonautonomous (Murali–Lakshmanan–Chua) MLC chaotic circuit is proposed. The main purpose of this study is to improve the performance of nonautonomous MLC chaotic circuit using only CFOAs. CFOA-based topology used in this realization enables to simulate floating inductance. This modification provides to the designer wideband chaotic signals for secure communication systems. In addition to this major improvement, a CFOA-based nonlinear resistor was used in the new realization of nonautonomous MLC chaotic circuit. The usage of CFOA-based inductance simulator and nonlinear resistor in the circuit structure reduces the component count and provides isolated outputs. The performance of the proposed inductorless nonautonomous chaotic circuit is demonstrated with both PSpice simulations and experimental results.

A Simple Grid Multiscroll Chaotic Electronic Oscillator Employing CFOAs

2014 ◽  
Vol 24 (02) ◽  
pp. 1450017 ◽  
Author(s):  
Yuan Lin ◽  
Chun Hua Wang ◽  
Jin Wen Yin ◽  
Yan Hu
Keyword(s):  
Theoretical Analysis ◽  
Circuit Design ◽  
Nonlinear Function ◽  
Operational Amplifiers ◽  
Chaotic Attractors ◽  
Simple Circuit ◽  
Chaotic Circuit ◽  
Current Feedback ◽  
Current Feedback Operational Amplifiers ◽  
Electronic Oscillator

In this paper, a novel grid multiscroll chaotic electronic oscillator with simple circuit design is proposed. The proposed grid multiscroll chaotic circuit only needs two current feedback operational amplifiers (CFOAs) as current integrators, passive RC, and nonlinear elements in the form of current stair nonlinear function series (SNFS) realized with CFOAs. Compared with existing grid multiscroll circuits such as Chua's circuit and Jerk circuit, etc., its component count is reduced. Mathematical models of the proposed generators are derived. Theoretical analysis and numerical simulations of the derived models are included. Moreover, the experimental results are verified that the proposed simpler chaotic electronic oscillator can generate grid multiscroll chaotic attractors with higher frequency.

VARIOUS CURRENT-MODE AND VOLTAGE-MODE INSTRUMENTATION AMPLIFIER TOPOLOGIES SUITABLE FOR INTEGRATION

2010 ◽  
Vol 19 (03) ◽  
pp. 689-699 ◽  
Author(s):  
ERKAN YUCE
Keyword(s):  
Integrated Circuit ◽  
Experimental Tests ◽  
Current Mode ◽  
The Other ◽  
Operational Amplifiers ◽  
Instrumentation Amplifier ◽  
Nmos Transistor ◽  
Current Feedback ◽  
Voltage Mode ◽  
Current Feedback Operational Amplifiers

In this paper, four instrumentation amplifier (IA) topologies, one of which is current-mode (CM) while the others are voltage-mode (VM), are presented. Three of the IAs use one to two current feedback operational amplifiers (CFOAs) while the other one employs only a single NMOS transistor. One of the IA circuits, given as an example, is simple while others are novel. The CM IA is composed of only grounded resistors which have some advantages in integrated circuit (IC) process. Non-ideality effects such as non-ideal gain and parasitic impedances on the performance of introduced IAs are discussed. In order to show the performance of the circuits, we perform experimental tests and simulations by using SPICE program.

scholarly journals CFOA-Based New Structure of Fractional Order Inverse Filters

2020 ◽  
Vol 8 (5) ◽  
pp. 4501-4504
Keyword(s):  
Stability Analysis ◽  
Fractional Order ◽  
Operational Amplifiers ◽  
Inverse Filter ◽  
Current Feedback ◽  
Current Feedback Operational Amplifiers ◽  
Low Pass ◽  
Band Pass ◽  
High Pass

This paper presents a CFOA-based fractional order inverse filter (FOIF) structure. Proposed structure utilizes two current feedback operational amplifiers (CFOAs), two fractional capacitors (FCs) and two resistors to design FOIFs to realize fractional order inverse low pass (FOILP), fractional order inverse high pass (FOIHP) and fractional order inverse band pass (FOIBP) responses. The proposed configuration of FOIFs is simulated in PSPICE using AD844 type CFOAs. Stability analysis and MATLAB simulations are also carried out to authenticate the theoretical propositions.

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