Which statement best characterizes an operational amplifier in open-loop versus closed-loop configurations?

• A. Open-loop has very high gain and saturates easily; closed-loop gain is set by feedback network.
• B. Open-loop has low gain; closed-loop has same gain as open-loop.
• C. Open-loop is less sensitive to input offset; Closed-loop amplifies noise.
• D. Open-loop uses feedback to stabilize gain; Closed-loop lacks feedback.

Answer: (A)

The essential idea is how feedback changes an op-amp’s behavior. Without feedback, the device multiplies the small difference between its inputs by an extremely large open-loop gain, so even a tiny difference pushes the output to a supply rail—this makes the operation highly nonlinear and prone to saturation. When feedback is used, the loop forces the input difference to stay very small and the overall gain becomes determined by the feedback network (the resistor values), not by the op-amp’s own open-loop gain. This yields a stable, predictable gain and much better linearity and bandwidth. So the statement is correct in saying open-loop has very high gain and saturates easily, while closed-loop gain is set by the feedback network.