A short-base diode is one where the widths of the p and n
Chapter 3, Problem 3.29(choose chapter or problem)
A short-base diode is one where the widths of the p and n regions are much smaller than and , respectively. As a result, the excess minority carrier distribution in each region is a straight line rather than the exponentials shown in Fig. 3.12.(a) For the short-base diode, sketch a figure corresponding to Fig. 3.12 and assume as in Fig. 3.12 that . (b) Following a derivation similar to that given in Section 3.5.2, show that if the widths of the p and n regions are denoted and thenand, for (c) Also, assuming , , show thatwhere(d) If a designer wishes to limit to 8 pF at I = 1 mA, what should be? Assume .Ln LpNA NDWp WnI Aqn i 2 Dp Wn xn () ND -----------------------------
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