5.9.3 Part III Low Frequency Response - BJT Calculations L4_3

# 5.9.3 Part III Low Frequency Response - BJT Calculations L4_3

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5.9.3 Part III BJT Common Emitter Amplifier Lecture 4 Part III Wed. Jan. 20, 2010

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2 BJT Amplifier (Figure 7.13) Method Of Short-Circuit Time Constants ω L = R C1S C C1 R C2S C C2 R CES C E 1 1 1 + +
3 Calculation of R C1S (= V t / I t ) Set V s = 0 and short C E C2 Replace C C1 by V t (R C1S = V t / I t ) V t / I t = R C1S = R s + R B || [r x + r π ]

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4 Calculation of R C2S Set V s = 0 and short C C1 E Replace C C2 by V t (R C2S = V t / I t ) No Signal Present (I b = 0) so V π m V π = 0 R C2S = V t / I t = R

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Unformatted text preview: L + R C || r O 5 Calculation of R CES Set V s = 0 and short C C1 & C C2 Replace C E by V t (R CES = V t / I t ) 6 Simple Case (neglect r O ) V e = V t I t = I b ’ + β I b ’ + V t /R E I b ’ = V t = V e r π + r x + R B || R ; I t = (1 + β ) V t r π + r x + R B || R 2 V t / I t = R CSS = r π + r x + R B1 || R B2 || R S ( β + 1) + V t / R E || R E...
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5.9.3 Part III Low Frequency Response - BJT Calculations L4_3

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