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L13 Part 2 CC_CE Open Ckt Time Constants_1_1

L13 Part 2 CC_CE Open Ckt Time Constants_1_1 - EE 311 EEO...

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EE 311 & EEO 311 L13 Part 2 6.11 CE-CC Two-Stage Amp Open-Circuit Time Constants Zubair Rehman
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2 (1) General Case: T 10 = R 10 C π T 20 = R 20 C μ R b , R e and R c are equivalent resistances which take into account input and/or output resistances of adjacent stages. (1) Special Case CE R e = 0 (1) Special Case CC R c = 0 (1) Special Case CB R b = 0 Summary of Open-Circuit Time Constants - BJT [ ] [ ] e x b e x b C e x b e m e b x R r r R R r R r R R r r R R R g R R r r R 129 + + + + + + 129( + + + 129 + + + = + + + = β β β π π π π ( ) ( * ( || 1 || 20 10 [ ] [ ] e x b e m e x b R r r R R R g R r R r R 129 + + + = + + + = β π π ( || 1 || 20 10 e x e x c e x e m e x R r r R r r R R r r R R g R r r R ) ( ) ( * ] ( [ || 1 || 20 10 1 + + + + 129( + + + 129 + + = + + = β β β π π π π ) 1 ( ) ( || 10 10 20 10 R g R R R r R r R m c x b + + = + = π
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3 Q 1 R e , R b , R c Q 2 R e , R b , R c Q1 R e1 = 0 R b1 = R12 || R11 || R sig = 50 R c1 = RC1 || R in2 Rin2 = ( β 2 + 129 * [R E2 || R L ] + r x2 + r π2 = (169 + 1) * [1.1 k || 1.1 k] + 10 + 514 = (170) * 0.55 k + .5 k = 90 k R C1 = RC1 || R in = 0.6 k || 90 k = 0.6 k Q2 RC2 = 0 R e2 = RE2 || R L = 1.1 k || 1.1 k = .55 k R b2 = RC1 || R outQ1 = RC1 || r 01 = 0.6 k || 7.4 k = 0.55 k
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4 Q 1 R e , R b , R c Q 2 R e , R b , R c Q1 R e1 = 0 R b1 = R12 || R11 || R sig = 50 R c1 = RC1 || R in2 Rin2 = ( β 2 + 129 * [R E2 || R L ] + r x2 + r π2 = (169 + 1) * [1.1 k || 1.1 k] + 10 + 514 = (170) * 0.55 k + .5 k = 90 k R C1 = RC1 || R in = 0.6 k || 90 k = 0.6 k Q1 CE C π1 = CBE1 = 1.16 E-10 = 116 pF R π 1 = R 10 = r π1 || (R b1 + r x1 ) = 469 || (50+10) = 53 R π 1 C π1 = 53 * 116 pF = 6170 ps = 6.17 ns
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