Basics of Op-Amp (Operational Amplifier)

An operational amplifier (op-amp) is a type of electronic direct-coupled amplifier (also, an analog-linear integrated circuit or IC) that amplifies the difference between two input voltages. It is a high-gain voltage amplifier with a differential input, level shifter and a single-ended output. Initially, these amplifiers were used in mathematical operations, thus the term 'operational' is used.Operational amplifiers (op-amps) are fundamental analog integrated circuits widely used in electronic design for a variety of functions including amplification, filtering, and mathematical operations. Initially developed for analog computers, op-amps have become versatile building blocks in modern electronics due to key characteristics such as very high gain, high input impedance, and low output impedance. This poster provides an overview of the basic principles, ideal characteristics, common circuit configurations, and diverse applications of op-amps. Key ideal characteristics—infinite open-loop voltage gain, infinite input impedance, and zero output impedance—serve as a reference model for practical circuit analysis and design. Common configurations discussed include inverting, non-inverting, summing, and difference amplifiers, along with specialized circuits like integrators and differentiators. This work highlights the enduring relevance and versatility of op-amps in contemporary signal conditioning, instrumentation, and control systems, providing essential knowledge for effective analog circuit design.