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solution

(a) There are three possible ways of keeping a BJT switch in the off state. These include (i) the open base (IB = 0), (ii) the B-E junction shorted (VBE = 0), and (iii) the B-E junction reverse-biased (VBE

(b) Find an expression for ICEO (the open-base, collector–emitter leakage current) in terms of ICBO (the open emitter, collector–base leakage current) and the forward current gain αF for case (i).

(c) Find an expression for ICES (the shorted base, collector–emitter leakage current) in terms of ICBO, αF, and αR for case (ii).

(d) Find an expression for ICER (the E-B junction reverse-biased) in terms of ICBO, αF, and αR for case (iii).

(e) If αF = 0.99 and αR = 0.1, calculate the ratio of the leakage current to ICBO for cases (i), (ii), and (iii).

Solution:

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