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For the given input waveform to the given circuit, what is the minimum value of the output waveform?

For the given input waveform to the given circuit, what is the minimum value of the output waveform? Correct Answer 4 V

The circuit above is a parallel clipper. When the input is less than 4V, then diode is forward biased and thus output voltage is 4V. When input increases above 4V, the diode is reverse biased and output is equal to the input. Hence, minimum output is 4V.

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