Which amplifier configuration allows an Operational Amplifier to function as a voltage follower?

Which amplifier configuration allows an Operational Amplifier to function as a voltage follower?

• A. Inverting configuration
• B. Non-inverting configuration
• C. Common emitter configuration
• D. Complementary push-pull configuration

Answer: (B)

The configuration that allows an Operational Amplifier (op-amp) to function as a voltage follower is the non-inverting configuration. In this setup, the input signal is applied to the non-inverting terminal of the op-amp, and the output is directly connected to the inverting terminal, creating a feedback loop. This arrangement ensures that the output voltage follows the input voltage closely, adhering to the ideal characteristics of a voltage follower, which has a gain of one. In practical terms, this means that the output voltage is equal to the input voltage, making it ideal for signal buffering and high input impedance applications. The non-inverting configuration is particularly useful in situations where the source needs to be protected from the load, as it provides the same voltage level to the output while maintaining a high input impedance that does not load down the preceding circuit. Other configurations, such as the inverting configuration or common emitter configuration, do not achieve this same result. Inverting configurations provide phase inversion and gain, while common emitter configurations typically pertain to bipolar junction transistor (BJT) amplifiers, which are fundamentally different from op-amp configurations. The complementary push-pull configuration applies to specific types of amplifier stages and is not relevant when discussing standard op

The configuration that allows an Operational Amplifier (op-amp) to function as a voltage follower is the non-inverting configuration. In this setup, the input signal is applied to the non-inverting terminal of the op-amp, and the output is directly connected to the inverting terminal, creating a feedback loop. This arrangement ensures that the output voltage follows the input voltage closely, adhering to the ideal characteristics of a voltage follower, which has a gain of one.

In practical terms, this means that the output voltage is equal to the input voltage, making it ideal for signal buffering and high input impedance applications. The non-inverting configuration is particularly useful in situations where the source needs to be protected from the load, as it provides the same voltage level to the output while maintaining a high input impedance that does not load down the preceding circuit.

Other configurations, such as the inverting configuration or common emitter configuration, do not achieve this same result. Inverting configurations provide phase inversion and gain, while common emitter configurations typically pertain to bipolar junction transistor (BJT) amplifiers, which are fundamentally different from op-amp configurations. The complementary push-pull configuration applies to specific types of amplifier stages and is not relevant when discussing standard op