Physics · Electronics

The correct answer is B: Externally connected resistance. The closed loop gain of an OP-AMP is determined by the feedback network, which typically consists of resistors connected externally. These resistors set the gain by forming a voltage divider in the feedback loop.

Option A is incorrect because the internal structure does not directly influence the closed loop gain, which is designed to be dependent on external components for flexibility and precision.

Option C is incorrect because the power supply voltage affects the maximum output swing and linearity but not the gain, provided it is within the operational range.

Option D is incorrect because input resistance affects how the OP-AMP interfaces with the input signal source, not the gain itself.

The closed loop gain is not influenced by the internal structure of the OP-AMP because it is determined by external components.

The closed loop gain of an OP-AMP is primarily determined by the ratio of the externally connected resistors in the feedback network.

The closed loop gain is independent of the power supply voltage as long as the OP-AMP operates within its specified range.

While input resistance affects input impedance, it does not directly determine the closed loop gain of the OP-AMP.