CSCCCECCAnalysis Lecture 20

CSCCCECCAnalysis Lecture 20 - Zubair Rehman Zac Lochner J J...

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Unformatted text preview: Zubair Rehman Zac Lochner J. J. Whalen EE 311 Lecture 20 & EEO 311 Lecture 19 Wed. Feb. 24, 2010 CS-CC-CE-CC Analysis: Voltage Gain Upper-Half Power Freq . 2 3 ϖ H = 1 / Σ Τ T = C π R π + C μ R μ for Q1, Q2, Q3 T = C gs R gs + C gd R gd for J1 ϖ H = 1 / (C gs R gs + C gd R gd + C π1 R π1 + C μ1 R μ1 + C π2 R π2 + C μ2 R μ2 + ...29 e m e b x R g R R r r R + + + = 1 10 π ( 29 [ ] ( 29 e x b e x b c e x b R r r R R r R r X R R r r R R ) 1 ( ) )( 1 ( 1 20 + + + + + + + + + + + + = β β β π π π 7 Q3 (CC) C π3 R π3 + C μ3 R μ3 R c = 0 R e3 = R6 || R L = 0.1 k || 0.1 k = 0.05 k = 50 Ω R b3 = R5 || R OUTQ2 = R5 || r o2 = 0.25k || ∞ = 250 Ω R π3 = r π3 || [(R b3 + R e3 )/(1 + g m3 R e3 )] r π3 = ( β+1 29 r e3 = ( β+1 29 *(V T /I E3 ) = 101 * (25 mV / 130 mA) = 101 * 0.192 = 19.4 Ω g m3 = 1 / r e3 = 1 / 0.192 = 5.1 S R π3 = 19.4 || [(250 + 50) / (1+5.1*50)] = 19.4 || (300/256) = 19.4|| 1.17 = 1.1 Ω R μ3 = R b3 || [r π3 + ( β+1 29 R e3 ] = R b3 || [( β+1 29 r e3 + ( β+1 29 R e3 ] = R b3 || [( β+1 29 (r e3 + R e3 )] R μ3 = 250 Ω || 101*(0.192 + 50) = 250 Ω || 5069 = 238 Ω 8 Next, Q2 CE Stage with r x2 = 0 & r o = infinity R e2 = 0 R b2 = R3 || R OUTQ1 R c2 = R5 || R INQ3 R π2 = r π2 || R b2 R μ2 = R π2 + R c2 (1 + g m2 R π2 ) = R π2 + R c2 (1 + R π2 / r e2 ) r π2 = ( β 2 +1 29 r e2 & r e2 = V T / I E2 = 25 mV / 25 mA = 1 Ω r π2 = 101 * 1 = 101 Ω R OUTQ1 = (r π 1 + R2 || R OUTJ1 ) / ( β 1 +1 29 R OUTJ1 = r o1 >>R2 r π 1 = 5* r π2 = 505 Ω R OUTQ1 = (505 + 4k) /101 = 45 Ω R b2 = R3 || R OUTQ1 = 660 || 45 = 42 Ω R π2 = r π2 || R b2 = 101 || 42 = 30 Ω R INQ3 = ( β 3 + 1) * (r e3 + R6 || R L ) R INQ3 = 101 * [0.192 + 100 || 100] = 5050 = 5.05 k R C2 = R5 || R INQ3 = 0 .25 || 5.05 k = 0.24 k = 240 Ω 9 Q1 CC Stage R C1 = 0 R b1 = R2 || R OUTJ1 = R2 || r 01 = R2 = 4 k for r 01 >> 4 k R e1 = R3 || R INQ2 where R INQ2 = r π2 = 101 R e1 = R3 || R INQ2 = 660 || 101 = 87.6 Ω R π1 = r π1 || [(R b1 + R e1...
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CSCCCECCAnalysis Lecture 20 - Zubair Rehman Zac Lochner J J...

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