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In the ac equivalent circuit shown in the figure, if i_in is the input current and R_F is very large, the type of feedback is

1. voltage-voltage feedback
2. voltage-current feedback
3. current-voltage feedback
4. current-current feedback

Correct answer: current-current feedback

Solution

When R_F is very large, the feedback mechanism primarily involves the output current being fed back to influence the input current, which characterizes it as current-current feedback.

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