# hw6 - ELEN 325 HOMEWORK#6(Due date Monday 1 For each...

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ELEN 325 HOMEWORK #6 ( Due date: Monday October 30, 2006) 1. For each circuit below, draw the AC-equivalent circuit and ﬁnd the small-signal gain ( v o /v i ). Assume β = 100 and V T = 25 mV. You can use the results from homework #5 for the DC solution. Simulate the circuits using PSPICE, and provide circuit schematics and AC magnitude plots. Use Q2N3904 and Q2N3906 transistors for simulation. (a) R 3 1k R 4 3k 50 R 5 C 2 Q 1 R 1 4k R 2 2k C 1 100 R s + - V i +3 +3 -3 -3 0 0 V o 8 (b) R 1 5k R 3 3k C 2 R 4 2k Q 1 C 3 10k R 5 + - V i 500 R s R 2 8k C 1 +9 +9 +9 0 0 0 V o 0 (c) 3k R 6 R 5 2k Q 2 R 8 6k R 3 2k R 1 33k R 2 17k R 4 1k Q 1 C 2 C 3 C 4 200 R 7 C 1 + - V i +5 0 0 +5 +5 +5 0 0 0 V o 0 1

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(d) C 2 1k R 3 Q 1 7k R 2 12k R 5 8k R 6 1k R 4 Q 2 + - V i 50 R s 3k R 1 C 1 +5 +5 +5 +5 -5 -5 -5 V o 0 8 (e) 10k R 1 3k R 3 5k R 2 2k R 4 Q 1 C 2 Q 2 C 3 R 7 1k R 5 500 R 6 100 + - V i C 1 1k R s +3 +3 -3 -3 +3 -3 0 0 V o 0 (f) (g) C 1 Q 2 3k R 1 10k R 2 Q 3 Q 1 + - V i +2 +2 -2 +2 -2 0 V o 1k R 4 Q 3 Q 2 25 R 5 Q 1 R 3 500 C 2 + - V i 200 R s R
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hw6 - ELEN 325 HOMEWORK#6(Due date Monday 1 For each...

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