Operational amplifier: what it means.
An operational amplifier is a differential amplifier with very high open-loop gain. With negative feedback and external components, op-amp circuits can perform operations including amplification, addition and integration. (Analog Devices: amplifiers)
The gain of the amplifier itself is not automatically the gain of the finished circuit. Feedback and surrounding components determine the intended relationship, while the real device imposes operating limits. (Analog Devices: amplifiers)
Put the definition to work.
Look at the complete circuit, not just the IC symbol. The surrounding connections and components are important to understanding what a particular amplifier circuit is intended to do.
Questions to ask next.
Use these questions as a reading checklist, not as a device-selection recommendation. Exact manufacturer documentation takes priority over a general definition.
- Input and output operating ranges
- Supply and frequency requirements
- Feedback arrangement and stability guidance
For the broader explanation, explore the complete integrated circuits guide. This page defines the term; the companion guide connects it to the rest of the system.
Common Operational amplifier questions.
Can I choose an op-amp using gain alone?
No. Identify the required signal behavior and review the device’s input, output, supply and frequency-related specifications. A general definition is not a complete circuit design. (Analog Devices: amplifiers)