HW8_10 - ECE2280 Homework#8 Spring 2010 1(a Assume the...

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1 ECE2280 Homework #8 Spring 2010 1. (a) Assume the transistors below have a finite β and an infinite Early voltage. Draw the small signal equivalent circuit (hybrid- π or model T) (b) Write an expression for the input resistance R in in the circuit shown. Your expression should include only real resistances ( R 1 , R 2 , R 3 , R 4 , or a subset of these) and possibly β , r e 1 or r π 1 , and r e 2 or r π 2 . (Assume all transistors have the same β .) Circle your answer. v O -V CC V CC R 1 R 3 R 2 R in Q 1 Q 2 R 4 V CC 2. (a) Use the circuit shown below. Assume all transistors are active and are the same and have a finite β and an infinite Early voltage. Draw the small signal equivalent circuit. (b) Write an expression for the input resistance R in in the circuit shown below. Your expression should include only real resistances ( R 1 , R 2 , R 3 , R 4 , R 5, R 6, R G1, R G2 or a subset of these) and possibly β , r e , or r π . + _ 1 R 4 R 5 R 2 R 3 R 2 Q 1 Q G1 R CC V + CC V + CC V + 3 Q CC V CC V - CC V - Rin R G2 R 6
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2 3. Use: ignore r o, |V BE |=0.7, β =100 V I = 20+0.001sin(20t)
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