Journal of Research in Electrical Circuits and Systems ISSN: 3139-2059 (Online)

Authors: K. Harish, P. Lakshmi Narayanan

Abstract: Renewable energy systems, including solar, wind, and hybrid energy setups, rely heavily on power electronic circuits for energy conversion, control, and integration with the grid. Power electronic converters such as inverters, DC–DC converters, and rectifiers play a pivotal role in ensuring efficient energy transfer and quality power delivery. This paper provides a comprehensive overview of power electronic circuit topologies for renewable energy applications, including design considerations, control strategies, and performance optimization techniques. Tables and two-dimensional figures are included to illustrate circuit operation, efficiency characteristics, and voltage/current waveforms. The paper aims to serve as a practical guide for engineers, researchers, and students working on renewable energy system design.

Keywords: Renewable energy, power electronics, inverters, DC–DC converters, energy conversion, grid integration

Authors: Dr. Anil K. Raj, Shreya P. Menon

Abstract: Electrical circuit optimization is critical for improving performance, minimizing power consumption, and enhancing reliability. Evolutionary algorithms (EAs) such as Genetic Algorithms (GA), Particle Swarm Optimization (PSO), and Differential Evolution (DE) have emerged as powerful tools for automated circuit design and optimization. This paper reviews EA-based optimization methods for analog, digital, and mixed-signal circuits. Key challenges, including multi-objective optimization, parameter constraints, and computational complexity, are addressed. Indian research contributions, case studies, and examples illustrate practical applications. Tables and 2D figures demonstrate optimization workflows, algorithm performance, and circuit-level implementations.

Keywords: Electrical circuit optimization, Evolutionary algorithms, Genetic algorithm, Particle swarm optimization, Differential evolution, Analog and digital circuits

Authors:  M. Siva Kumar, Satish Kumar Das

Abstract: Thermal effects have emerged as a fundamental constraint in high-density circuit design. As feature sizes shrink and power density increases, heat generation within integrated circuits (ICs) and printed circuit boards (PCBs) threatens both performance and reliability. This paper presents an in-depth exploration of thermal challenges, modeling techniques, mitigation strategies, and empirical assessments in modern circuit designs. Key contributions include analyzing self-heating, hotspots, thermal resistance behaviors, and advanced thermal management methodologies such as micro-channel cooling and integrated heat sinks. Standard numerical methods, coupled electro-thermal simulations, and empirical results from literature form the basis of analysis. This work concludes with recommended practices for designers and future research directions.

Keywords: Thermal effects, high-density circuits, heat management, PCB design, micro-channels, thermal modeling, reliability.

Authors: P. Senthil Kumar, R. UmaMaheswari

Abstract Modern electrical and electronic circuits increasingly employ nonlinear components such as diodes, transistors, thyristors, and power semiconductor devices. These nonlinear elements introduce complex relationships between voltages and currents, making analytical solutions based on classical linear techniques impractical or impossible. Numerical methods provide an effective and systematic approach for analyzing nonlinear circuits by approximating solutions to the governing equations through iterative computation. This paper presents a comprehensive study of nonlinear circuit analysis using numerical methods. Fundamental concepts of nonlinearity, formulation of circuit equations, and commonly used numerical techniques such as Newton–Raphson, piecewise-linear approximation, and time-domain integration methods are discussed. Practical challenges, convergence issues, and computational considerations are also examined. Tables and two-dimensional figures are included to enhance conceptual clarity. The paper emphasizes the importance of numerical methods as indispensable tools for accurate analysis and simulation of nonlinear electrical circuits.

Keywords: Nonlinear circuits, numerical methods, Newton–Raphson method, iterative techniques, circuit simulation, convergence analysi

Authors: Dr. Ananya R. Menon, Rohit P. Nair

Abstract: Accurate parameter estimation is essential for reliable circuit modeling and simulation. Parameter estimation techniques are used to extract component values and system characteristics from measured data to create precise models for SPICE simulations, real-time control, and fault diagnosis. This paper reviews techniques such as least squares, optimization-based methods, neural networks, and hybrid approaches for parameter estimation in analog, digital, and power electronic circuits. Challenges like measurement noise, nonlinearity, and computational complexity are discussed. Indian contributions from smaller institutions are highlighted. Tables and 2D figures illustrate estimation workflows, methods, and circuit-level applications.

Keywords: Parameter estimation, Circuit modeling, Optimization, Least squares, Neural networks, Electrical circuits, SPICE

Authors: Dr. Manish K. Sharma, Priya S. Menon

Abstract: The Internet of Things (IoT) revolution relies heavily on the seamless integration of sensors, processing units, and communication modules in compact, low-power, and reliable circuits. Designing circuits for IoT applications poses unique challenges due to the conflicting requirements of energy efficiency, miniaturization, wireless communication, and security. This paper examines these circuit design challenges in detail, addressing power management, signal integrity, heterogeneous integration, and sensor interface design. Strategies for mitigating challenges using innovative circuit architectures, energy harvesting, and low-power wireless design are discussed. Indian research contributions from small and mid-sized institutions are highlighted, providing practical insights into real-world IoT hardware development. The paper includes tables and 2D figures illustrating circuit topologies, power flows, and system-level design trade-offs.

Keywords: IoT circuit design, Low-power design, Sensor interface, Wireless communication, Energy harvesting, Embedded systems

Authors: Nandhakumar, J. Kalaiselvi

Abstract: With continuous scaling of semiconductor technology and the rapid increase in operating frequencies, high-speed digital circuits have become a cornerstone of modern electronic systems. At gigahertz data rates, interconnects behave as transmission lines and parasitic effects dominate circuit behavior, leading to signal integrity issues such as reflections, crosstalk, delay, and jitter. Accurate modeling of high-speed digital circuits is therefore essential to predict system behavior and ensure reliable operation. This paper presents a comprehensive discussion on high-speed digital circuit modeling and signal integrity analysis. Various modeling approaches for drivers, interconnects, and receivers are explained along with time-domain and frequency-domain analysis techniques. Key signal integrity problems and their mitigation strategies are examined. Tables and two-dimensional figures are included to support conceptual understanding. The paper aims to provide a structured overview for students and engineers involved in high-speed digital system design.

Keywords: High-speed digital circuits, signal integrity, transmission lines, interconnect modeling, crosstalk, jitter

Authors: R. Suresh, M. Anitha

Abstract: Harmonics in power systems, generated by nonlinear loads and switching devices, can lead to equipment overheating, increased losses, voltage distortion, and resonance phenomena. Accurate modeling and analysis of harmonics are essential for system design, operation, and mitigation strategies. This paper explores the use of circuit models for harmonic analysis in electrical power systems, including modeling techniques, frequency-domain analysis, and mitigation approaches. The paper discusses the application of linearized network models, frequency-sweep simulations, and power quality indices. Tables and two-dimensional figures illustrate harmonic spectra, voltage distortion, and system impedance characteristics. The insights provided are intended for researchers, engineers, and students focused on power system analysis and design.

Keywords: Harmonics, power systems, circuit models, nonlinear loads, voltage distortion, harmonic mitigation

Authors: Dr. Kiran R. Deshpande, Meera S. Rao

Abstract: The increasing complexity and computational demands of artificial intelligence (AI) algorithms have necessitated the development of specialized hardware systems. Hardware realization of AI enables faster processing, lower latency, reduced energy consumption, and enhanced integration of machine learning models in edge devices. This paper explores key hardware platforms for AI realization, including GPUs, FPGAs, ASICs, and emerging neuromorphic architectures. We discuss circuit-level implementations of AI primitives, such as matrix multiplication, activation functions, and convolutional layers, highlighting analog and digital approaches. The paper also presents Indian research contributions, design challenges, system architectures, and applications in robotics, autonomous vehicles, and IoT systems. Tables, 2D figures, and references illustrate the state of the art and practical considerations for AI hardware realization.

Keywords: Artificial intelligence hardware, FPGA, ASIC, Neuromorphic circuits, AI accelerators, Edge computing

Authors: K. Suresh Babu, L. Revathi

Abstract: Noise is an inherent and unavoidable phenomenon in analog electronic circuits, arising
from the physical properties of electronic components and devices. It limits the minimum detectable signal, degrades signal integrity, and significantly affects the performance of amplifiers, sensors, and communication systems. A thorough understanding of noise sources, modeling techniques, and noise mitigation strategies is essential for effective analog circuit design. This paper presents a detailed study of noise analysis in analog electronic circuits. Fundamental noise mechanisms such as thermal noise, shot noise, flicker noise, and burst noise are discussed along with their mathematical models. Noise analysis methods for basic analog building blocks, including resistive networks and amplifiers, are examined. The paper also highlights
design trade-offs between noise, power consumption, and bandwidth. Tables and two- dimensional figures are included to enhance clarity and understanding.

Keywords: Noise analysis, analog circuits, thermal noise, flicker noise, signal-to-noise ratio, low-noise design

Authors: T. Balaji, A. Meena

Abstract: Network synthesis is a fundamental area of electrical engineering concerned with the systematic design of electrical networks that satisfy prescribed performance specifications. When restricted to passive components such as resistors, inductors, and capacitors, network synthesis plays a critical role in the design of filters, impedance matching networks, attenuators, and signal conditioning circuits. Passive network synthesis ensures inherent
stability, reliability, and low noise, making it highly desirable in analog and power applications. This paper presents a comprehensive study of network synthesis using passive
components. Classical synthesis techniques based on driving-point functions, positive real functions, and canonical forms are discussed in detail. Foster and Cauer synthesis methods are explained with conceptual clarity. Practical considerations, limitations, and modern
applications are also examined. Tables and two-dimensional figures are included to aid understanding. The paper highlights the continued relevance of passive network synthesis in contemporary electrical engineering despite the rise of active and digital systems.

Keywords: Network synthesis, passive components, Foster forms, Cauer forms, positive real functions, impedance synthesis

Authors: K. Aravind, D. Nithya

Abstract: Electrical distribution systems deliver power from substations to consumers while maintaining reliability, efficiency, and power quality. Accurate modeling and
simulation are essential for planning, fault analysis, voltage regulation, and integration of distributed energy resources. This paper presents a comprehensive study of modeling
techniques for radial, loop, and networked distribution systems, including load modeling, feeder modeling, and transformer representation. Simulation methodologies
using software tools such as MATLAB/Simulink and DIgSILENT PowerFactory are discussed. Two-dimensional figures, tables of parameters, and case studies illustrate
performance evaluation and optimization. The paper serves as a guide for engineers and researchers in power system design, operation, and analysis.

Keywords: Electrical distribution systems, modeling, simulation, load flow, voltage profile, reliability, power quality.

Authors: Dr. Thamatam Venkata Chalama Reddy, Deepthi M S

Abstract: Memristor-based circuits have transitioned from a theoretical curiosity to an applied engineering frontier in the domains of logic design, memory systems,neuromorphic
computing, and digital signal processing. This paper explores the fundamental properties of memristors, circuit design techniques that leverage their unique characteristics, and the various real-world applications where they are showing tangible promise. We examine memristor models, hybrid circuit implementations, and performance advantages over traditional CMOS approaches. Indian research contributions are highlighted throughout the paper, paired with analyses of memristor-inspired designs that promise lower power consumption and higher density.
The paper is structured to provide both a comprehensive review and original insights into the future trajectory of memristor circuit applications.

Keywords: Memristor, Memristor circuits, Hybrid logic, Neuromorphic computing, Low-power design, Memristor applications.

Authors: V. Prakash, S. Meena Devi

Abstract: The rapid growth of portable, wearable, and battery-operated electronic devices has intensified the demand for low-power analog circuit design. Analog blocks such as amplifiers, comparators, oscillators, and data converters play a crucial role in interfacing real-world signals with digital systems. However, these circuits often
dominate power consumption, especially in mixed-signal systems. This paper presents a comprehensive study of low-power analog circuit design techniques aimed at
minimizing energy consumption while maintaining acceptable performance. Fundamental power dissipation mechanisms, design trade-offs, and circuit-level
optimization strategies are discussed. Techniques such as supply voltage scaling, bias current optimization, subthreshold operation, and low-power amplifier architectures are analyzed. Tables and two-dimensional figures are included to support the discussion. The paper provides a structured overview suitable for students,
researchers, and practicing engineers working on energy-efficient analog integrated circuit design.

Keywords: Low-power design, analog circuits, power dissipation, subthreshold operation, CMOS analog design, energy efficiency

Authors: R. Mahendran, S. Kavitha

Abstract: Electrical circuit analysis has traditionally relied on algebraic and differential equation based techniques such as Kirchhoff’s laws, nodal analysis, and mesh analysis. With the increasing complexity of modern electrical networks, including large-scale power systems, integrated circuits, and communication networks, these classical approaches often become computationally intensive and conceptually opaque. Graph theory offers an elegant mathematical framework that represents electrical circuits as graphs composed of nodes and edges, enabling systematic, compact, and scalable analysis. This paper presents a comprehensive study of graph theory applications in electrical circuit analysis. Fundamental graph concepts such as trees, loops, cut-sets, incidence matrices, and tie-set matrices are discussed in the context of circuit modeling. The paper further explores how graph-theoretic methods simplify network topology description, aid in automated circuit analysis, and support advanced applications such as fault detection and network optimization. Illustrative examples, tables, and two-dimensional figures are included to demonstrate practical implementation. The study highlights the relevance of graph theory as a bridge between abstract mathematics and real-world electrical engineering problems.

Keywords: Graph theory, electrical circuits, network topology, incidence matrix, tie set, cut-set, circuit analysis

Authors: R. Senthil Kumar, M. Kalaiselvi

Abstract: With the continuous growth in complexity and density of digital integrated circuits, ensuring correctness and reliability has become a critical challenge. Fault modeling and testing play a vital role in identifying manufacturing defects, aging-related failures, and operational faults in digital systems. Effective fault models allow designers to predict faulty behavior, generate test patterns, and evaluate fault coverage systematically. This paper presents a detailed study of fault modeling techniques and digital circuit testing methodologies. Classical and modern fault models such as stuck at, bridging, delay, and transient faults are discussed along with test generation and design-for-testability approaches. Tables and two-dimensional figures are included to support conceptual understanding. The paper serves as a comprehensive reference for students and engineers involved in digital system design and testing.

Keywords: Digital circuit testing, fault modeling, stuck-at faults, delay faults, DFT, fault coverage

Authors: S. Murugan, A. Revathi

Abstract: The growing demand for portable, battery-powered, and environmentally sustainable electronic systems has placed energy efficiency at the forefront of logic circuit design. Logic circuits constitute the fundamental building blocks of digital systems, and their power consumption significantly impacts overall system performance and battery life. Energy-efficient logic circuit design aims to minimize power dissipation while maintaining required speed, functionality, and reliability. This paper presents a comprehensive study of energy-efficient logic circuit design techniques, including power dissipation mechanisms, logic styles, voltage scaling, clock gating, and architectural optimizations. Comparative tables and two-dimensional figures are included to aid understanding. The paper provides a structured overview suitable for students, researchers, and engineers involved in low-power and energy-aware digital design.

Keywords: Energy-efficient design, logic circuits, low-power VLSI, dynamic power, leakage power, CMOS logic

Authors: Divya R. Menon, Anil B. Sharma

Abstract: Electromagnetic Compatibility (EMC) sits at the crossroads of circuit design and real-world electrical environments. With modern systems becoming progressively denser, faster, and more intertwined, unwanted electromagnetic interference (EMI) threatens the proper function, safety, and regulatory compliance of electronic devices. This paper presents a comprehensive analysis of EMC principles in circuit systems. Delving into EMI sources, coupling mechanisms, measurement methods, mitigation techniques, design practices, and standards, it synthesizes literature and practical approaches. Advanced topics such as high-speed PCB EMC issues and power converter EMC compliance are also explored. Through tables, figures, and references to foundational and contemporary research, designers and engineers will find an integrated perspective on ensuring electromagnetic harmony in complex circuit ecosystems.

Keywords: Electromagnetic compatibility, electromagnetic interference, PCB design, mitigation tec hniques, conductance, radiative coupling, standards.

Authors: Dr. Arjun P. Menon, Meera S. Nair

Abstract: Electric vehicles (EVs) rely on complex electrical circuits for energy management, propulsion, power electronics, and battery management systems. Understanding the design, simulation, and optimization of these circuits is critical for efficiency, reliability, and safety. This paper presents a comprehensive overview of electrical circuits in EV systems, including battery packs, inverters, DC-DC converters, motor drives, and auxiliary systems. Challenges in circuit design, fault management, and efficiency optimization are discussed. Indian research contributions from smaller institutions are highlighted. Tables and 2D figures illustrate EV circuit architecture, power flow, and system components.

Keywords: Electric vehicles, Electrical circuits, Battery management system, Inverter, Motor drive, DC-DC converters, Power electronics

Authors: K. Ravichandran , P. Nithya

Abstract: Embedded systems increasingly rely on mixed-signal circuits that integrate analog and digital components on a single chip or module. These circuits form the interface between the physical world and digital processing units by enabling signal acquisition, conditioning, conversion, and control. The design of mixed-signal circuits presents unique challenges due to the interaction between continuous-time analog blocks and discrete-time digital logic. Issues such as noise coupling, power management, clock interference, and process variations significantly affect performance and reliability. This paper presents a comprehensive overview of mixed-signal circuit design for embedded systems. Key building blocks, design methodologies, noise mitigation techniques, and testing considerations are discussed. Tables and two-dimensional figures are included to enhance clarity. The paper aims to serve as a structured reference for students, researchers, and engineers working in the field of embedded and mixed-signal system design.

Keywords: Mixed-signal circuits, embedded systems, analog-digital integration, ADC, DAC, noise coupling, system-on-chip

Authors: Dr. Rajesh V. Menon, Swathi Nair

Abstract: Electrical control systems (ECS), including Supervisory Control and Data Acquisition (SCADA) and Industrial Control Systems (ICS), are increasingly connected to networks and cloud platforms, exposing them to cybersecurity threats. Cyberattacks on ECS can lead to operational disruption, safety hazards, and financial losses. This paper reviews cybersecurity issues in electrical control systems, highlighting attack vectors, system vulnerabilities, and risk assessment strategies. Circuit-level implications, communication vulnerabilities, and protection mechanisms are examined. Indian contributions and case studies from smaller institutions are also discussed. Tables and 2D diagrams illustrate typical ECS architectures, attack surfaces, and mitigation strategies.

Keywords: Electrical control systems, SCADA security, ICS cybersecurity, Network vulnerabilities, Threat mitigation

Authors: R. Senthilkumar, M. Kavitha

Abstract: Clock distribution and timing analysis are fundamental aspects of very large scale integration (VLSI) system design. As integrated circuits scale to deep submicron technologies and operate at multi-gigahertz frequencies, reliable clock delivery and accurate timing verification become increasingly challenging. Clock networks consume a significant fraction of total chip power and are highly sensitive to process variations, temperature fluctuations, and supply noise. Improper clock design can lead to excessive skew, jitter, and timing violations, ultimately causing functional failures. This paper presents a comprehensive study of clock distribution techniques and timing analysis methodologies in VLSI systems. Various clock tree and clock mesh architectures are discussed along with timing constraints, skew reduction strategies, and analysis approaches. Tables and two-dimensional figures are included to aid understanding. The paper provides a structured overview suitable for students, researchers, and practicing engineers involved in modern VLSI design.

Keywords: VLSI systems, clock distribution, timing analysis, clock skew, jitter, clock tree synthesis

Authors:  S. Karthik, R. Priya

Abstract: Energy storage systems (ESS) play a pivotal role in modern power networks, enhancing grid stability, supporting renewable integration, and providing backup power. Circuit based approaches offer a practical framework for modeling, analyzing, and optimizing ESS performance. This paper explores circuit-level modeling techniques for batteries, supercapacitors, and hybrid storage systems, highlighting equivalent circuit models, state-of-charge estimation, and power electronic interfacing. Simulation methodologies, performance metrics, and practical applications are discussed with tables and two-dimensional figures to support design and analysis. The paper serves as a reference for engineers and researchers developing energy storage solutions for efficient and reliable electrical systems.

Keywords: Energy storage systems, circuit modeling, battery equivalent circuits, supercapacitor, hybrid storage, power electronics

Authors: Dr. Sunita K. Rao, Ankit Verma

Abstract: Bio-inspired electrical circuits and systems emulate functional principles found in living organisms to achieve improved efficiency, adaptability, and robustness in electronic design. These systems leverage mechanisms such as neural processing, sensory feedback, adaptive control, and self-organization to address challenges in conventional circuit design. This paper presents a comprehensive overview of bio inspired electrical systems, including analog and digital neural circuits, swarm inspired optimization for circuit design, bio-mimetic sensors, and adaptive control systems. Examples are provided of practical applications in robotics, neuromorphic computing, and sensor networks. Design challenges, performance evaluation, and emerging research directions are discussed. Indian contributions from small and mid sized institutions are highlighted, showcasing the global and national relevance of bio inspired electronics.

Keywords: Bio-inspired circuits, Neuromorphic computing, Biomimetic sensors, Swarm intelligence, Adaptive control

Authors: N. Karthikeyan, V. Jayanthi

Abstract: Duality is a fundamental and elegant principle in electrical network theory that establishes a one-to-one correspondence between two different electrical networks exhibiting analogous behavior. By applying duality principles, engineers can derive the solution of a complex network from its dual counterpart with minimal additional effort. This concept not only simplifies analysis but also plays a significant role in network design and synthesis. Duality provides deep insight into the relationship between electrical quantities such as voltage and current, impedance and admittance, and series and parallel connections. This paper presents a comprehensive discussion on the duality principles in electrical network design. Theoretical foundations, conditions for duality, element transformations, and mathematical interpretations are explored in detail. Practical applications in network synthesis, filter design, and power system modeling are highlighted. Tables and two-dimensional figures are included to clarify transformations and design approaches. The paper emphasizes the enduring importance of duality in both classical and modern electrical engineering practice.

Keywords: Duality principle, electrical networks, network design, impedance admittance duality, circuit transformation, network synthesis