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# hw1 - 1.26(a i R vs v th R2 1 i Vth = Voc = i R2 but i = vs...

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1.26 (a) V th = V oc = - β i R 2 but i = - v s R 1 and V th = β v s R 2 R 1 = 120 v s 39 k 100 k = 46.8 v s R th = v x i x ; i x = v x R 2 + β i but i = 0 since V R 1 = 0. R th = R 2 = 39 k . Thévenin equivalent circuit: (b) R 1 R 2 β i v s i + - v th R 1 R 2 β i i R th v x i x 58.5v s 39 k

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V th = V oc = - β i R 2 where i + bi + i s = 0 and V th = - β - i s β + 1 R 2 = 38700 i s R th = v x i x ; i x = v x R 2 + β i but i + β i = 0 so i = 0 and R th = R 2 = 39 k Thévenin equivalent circuit: 1.29 The open circuit voltage is v th = - g m v R 2 and v = + i s R 1 . v th = - g m R 1 R 2 i s = - 0.0025 ( 29 10 5 ( 29 10 6 ( 29 i s = 2.5 x 10 8 i s For i s = 0, v = 0 and R th = R 2 = 1 M R 1 R 2 β i i s i + - v
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hw1 - 1.26(a i R vs v th R2 1 i Vth = Voc = i R2 but i = vs...

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