The closed loop gain of OP-AMP depends on:
Correct answer: B. Externally connected resistance
- A. Internal structure of OP-AMP
- B. Externally connected resistance
- C. Voltage of power supplies
- D. Input resistance
Explanation
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.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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