L17Part1CC_CE OpenCircuits Time Constants New_1

# L17Part1CC_CE OpenCircuits Time Constants New_1 - EE...

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1 ω H = 1 / (R 10 C π1 + R 20 C μ1 + R 30 C π2 + R 40 C μ2 ) β = 100 I E1 = 1 mA = I E2 g m1 = 40 mS = g m2 r e1 = r e2 = 1 / g m = 25 Ω r π1 = r π2 = β / g m = 100/40mS = 2.5 kΩ C μ1 = C μ2 = 2 pF C π1 = C π2 = 14 pF (f T = 400 MHz) r x = 0 r o = infinity r μ = infinity EE Lecture 17& EEO 311 Lecture 16 Part 1 6.11.1 CC-CE Cascade

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Q1 CC (R c = 0) R 10 = r π1 || [(r x1 + R b1 + R e1 ) / (1 + g m R e1 )] R 20 = (R b1 + r x1 ) || [r π1 + R e ( β+129 ] R b1 = R1 || R2 || R S = 100 k || 100 k || 4 k = 3.7 k R e1 = R E1 || R IN,2 R IN,2 = r π2 + ( β 2 +1) * 0 = r π2 = 2.5 k R e1 = 4.3 k || 2.5 k = 1.58 k = 1.6 k R 10 = r π1 || [(r x1 + R b1 + R e1 ) / (1 + g m R e1 )] R 10 = 2.5 k || (0 + 3.7 k + 1.6 k) / (1 + 40 mS*1.6k) = 2.5k || (5.3 k / 65) = 2.5 k || 0.082 k = 79 R 20 = (R b1 + r x1 ) || [r π1 + R e1 ( β+129 ] R 20 = (3.7 k + 0) || (2.5 k + 1.6 k*101) = 3.7 k || 162 k = 3.6 k R 10 C π1 = 79 * 14 pF = 1106 ps = 1.1 ns R 20 C μ1 = 3.6 k * 2 pF = 7.2 ns
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## This document was uploaded on 09/28/2011.

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L17Part1CC_CE OpenCircuits Time Constants New_1 - EE...

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