Microelectronic Circuit Design

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CHAPTER 5 5.1 Base Contact = B Collector Contact = A Emitter Contact = C n-type Emitter = D n-type Collector = F Active Region = E 5.2 V C B E + - + - v BE - + v BC i C i E i B For V BE > 0 and V BC = 0, I C = β F I B or β F = I C I B = 275 μ A 4 μ A = 68.8 β R = α R 1 α R = 0.5 1 0.5 = 1 I C = I S exp V BE V T or I S = I C exp V BE V T = 275 μ A exp 0.64 0.025 = 2.10 fA 5.3 + + - v BC i E i C i B C E B - + - V v BE For V BC > 0 and V BE = 0, I E = − β R I B or β R = − I E I B = − 275 μ A 125 μ A = 2.20 β F = α F 1 α F = 0.975 1 0.975 = 39 I E = − I S exp V BC V T or I S = I C exp V BE V T = 275 μ A exp 0.63 0.025 = 3.13 fA 123
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