What is an OpAmp?

What is an OpAmp?

• A. An opamp or operational amplifier is an integrated circuit that can amplify weak electric signals.
• B. A digital signal processor used for complex computations.
• C. A sensor used to measure physical quantities.
• D. A passive resistor network used for filtering.

Answer: (A)

An op-amp is an integrated circuit designed to amplify small electrical signals. It behaves as a high-gain differential amplifier with two inputs (inverting and non-inverting) and a single output, and its real usefulness comes from using negative feedback to set a stable, predictable gain and linearize the response. Because it’s an active device, it needs power rails to operate, yet it presents very high input impedance so it won’t load the source, and low output impedance so it can drive subsequent stages. This makes it a versatile building block for many analog signal-processing tasks, from simple amplification to filters, integrators, and comparators. The other options don’t fit because a digital signal processor performs complex digital computations, a sensor measures physical quantities, and a passive resistor network provides no gain or active amplification.

An op-amp is an integrated circuit designed to amplify small electrical signals. It behaves as a high-gain differential amplifier with two inputs (inverting and non-inverting) and a single output, and its real usefulness comes from using negative feedback to set a stable, predictable gain and linearize the response. Because it’s an active device, it needs power rails to operate, yet it presents very high input impedance so it won’t load the source, and low output impedance so it can drive subsequent stages. This makes it a versatile building block for many analog signal-processing tasks, from simple amplification to filters, integrators, and comparators. The other options don’t fit because a digital signal processor performs complex digital computations, a sensor measures physical quantities, and a passive resistor network provides no gain or active amplification.