L17Part2CC_CE_Short Circuit Time Constants_1

L17Part2CC_CE_Short Circuit Time Constants_1 - L17 Part 2...

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1 β = 100 I E1 = 1 mA = I E2 g m1 = 40 mS = g m2 r e1 = r e2 = 1 / g m = 25 Ω r e = V T / I E1 = 25mV/1mA = 25 Ω r π1 = r π2 = β / g m = 100/40mS = 2.5 kΩ r x = 0 r o = infinity r μ = infinity L17 Part 2 – Low Freq. Response 6.11.1 CC-CE Cascade – Short Circuit Time Constants E S C S C S L C R C R C R 3 2 2 1 1 1 1 1 + + = ϖ
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2 R 1S = R S + R1 || R2 || R INQ1 R INQ1 = r x1 + r π1 + R e1 ( β+129 where R e1 = R E1 || R INQ2 = R E1 || (r x2 + r π 2 ) = 4.3k || [0 +2.5k] = 1.6 k R INQ1 = 0 + 2.5 k + 101*1.6 k = 164 k R 1S = 4 k + 100k || 100k || 164 k = 4k + 38.3k = 42.3 k R 1S C C1 = 42.3 k * 1 μF = 42.3 ms R 2S = R C + R L = 4 k + 4 k = 8 k R 2S C C2 = 8 k * 1 μF = 8 ms Hz C R s rad ms C R C S C S 8 . 3 2 1 / 6 . 23 3 . 42 1 1 1 1 1 1 = = = π Hz C R s rad ms C R C S C S 20 2 1 / 125 8 1 1 2 2 2 2 = = =
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3 R 3S = R E2 || “R OUTQ2 “R OUTQ2 = (r π 2 + r x2 + R b2 ) / ( β + 1) R b2 = R E1 || R OUTQ1
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L17Part2CC_CE_Short Circuit Time Constants_1 - L17 Part 2...

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