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# q06 - ECE 3050 Analog Electronics Quiz 6 Professor Leach...

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ECE 3050 Analog Electronics Quiz 6 September 30, 2009 Professor Leach Name Instructions. Print your name in the space above. Place a box around your answers. Points will be subtracted if you do not express each numerical answer as a decimal number and if you do not put a box around answers. Honor Code Statement: I have neither given nor received help on this quiz. Initials 1. The fi gure shows the ac signal circuit for a di ff erential ampli fi er. For each BJT, it is given that α = 0 . 99 , β = 99 , r x = 0 , g m = 49 . 5 mS , r π = 2 k , r e = 20 , r 0 = , R B = 1 k , R E = 70 , R Q = 50 k , and R C = 12 k . (a) Replace v s 1 and v s 2 with di ff erential inputs. Solve for the di ff erential gain A v ( d ) = v o 1 /v id . (b) Replace v s 1 and v s 2 with common-mode inputs. Solve for the common-mode gain A v ( cm ) = v o 1 /v icm . (c) What is the common-mode rejection ratio?

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