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For small-signal operation around the dc bias point, the diode is modeled by a resistance equal to the

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For small-signal operation around the dc bias point, the diode is modeled by a resistance equal to the

(a) Slope of the i-v characteristics of the diode at the bias point

(b) Square root of the slope of the i-v characteristics of the diode at the bias point

(c) Inverse of the slope of the i-v characteristics of the diode at the bias point

(d) Square root of the inverse of the slope of the i-v characteristics of the diode at the bias point

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Asked question is from Modelling the Diode Forward Characteristics in chapter Diodes of Electronic Devices & Circuits

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The correct choice is (d) Square root of the inverse of the slope of the i-v characteristics of the diode at the bias point

To elaborate: It is a required characteristic for small-ground operations.

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