Which of the following is the most predominant general-purpose linear integrated circuit?

Operational amplifiers are widely regarded as the most predominant general-purpose linear integrated circuits due to their versatility and broad range of applications in electronic circuits. They serve as essential building blocks for numerous functions, including amplification, signal conditioning, filtering, and mathematical operations such as addition, subtraction, integration, and differentiation.

The architecture of operational amplifiers, characterized by high gain, high input impedance, and low output impedance, allows them to be used effectively in both positive and negative signal processing without significantly affecting the source. This makes them incredibly valuable in various fields, from audio processing to instrumentation and control systems.

Their extensive use in the industry is complemented by the availability of many op-amp models with different specifications, making them suitable for different applications and enhancing their appeal as the go-to choice for engineers and technicians in circuit design and implementation.