For the diode of Fig., determine the maximum ac (dynamic) resistance at a forward current...

Refer the terminal characteristics of a high-voltage diode from Figure \(1.37\) in textbook.

Consider the following points on the graph from Figure \(1.37(\mathrm{f})\) in textbook.

Table 1 show the ac resistance, \(R_{D}\) for the forward bias currents \(I_{F}\).

$$ \begin{array}{|l|l|} \hline \text { Forward current, } I_{F} & \text { ac resistance, } R_{D} \\ \hline 0.1 \mathrm{~mA} & 700 \Omega \\ \hline 1.5 \mathrm{~mA} & 70 \Omega \\ \hline 20 \mathrm{~mA} & 6 \Omega \\ \hline \end{array} $$

The table supports the fact that the dynamic resistance \(R_{D}\) decreases when the current \(I_{F}\) increases.