In open-loop operation, op-amps exhibit what kind of sensitivity to input voltage variations?

In open-loop operation, op-amps exhibit what kind of sensitivity to input voltage variations?

• A. Very low
• B. High
• C. No sensitivity
• D. Insensitivity

Answer: (B)

Open-loop operation makes the amplifier respond with enormous gain to any small difference between the input terminals. The output follows Vout ≈ Aol × (V+ − V−), and with Aol often in the 100,000 to 1,000,000 range, tiny input differences (offsets, noise, drift) produce large output swings. Without feedback to limit or linearize this gain, the output tends to saturate at the supply rails, showing extremely high sensitivity to input voltage variations. Hence the correct idea is that the sensitivity is high.

Open-loop operation makes the amplifier respond with enormous gain to any small difference between the input terminals. The output follows Vout ≈ Aol × (V+ − V−), and with Aol often in the 100,000 to 1,000,000 range, tiny input differences (offsets, noise, drift) produce large output swings. Without feedback to limit or linearize this gain, the output tends to saturate at the supply rails, showing extremely high sensitivity to input voltage variations. Hence the correct idea is that the sensitivity is high.