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전자회로(기말 고사 문제지)2012-2

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전자회로(기말 고사 문제지)2012-2

  1. 1. 2012 final-term examination (120) Electronic Circuits Date: December 10, 2012. 1. Consider the following CE amplifier circuit. (100) 1) Calculate the equivalent Thevenin circuit ( V BB , R BB ) for the base of Q1 in terms of a DC bias circuit. (20) 2) Calculate the bias condition ( I C , VCE ) for the above circuit for V BE = 0.7V , β = 150 . (20) 3) Present the hybrid Π model for Q1. (10) Hint:) VT = 25 [mV] 4) Get the AC gain [dB] ( A = V0 / Vi ) when capacitors are shorted. (20) 5) Calculate the impedance of capacitors, CC1, CC2, CB when f = 1 [kHz]. (10) What is the meaning of this small impedance? (10) Hint:) Z c = 1 jωC 6) Suggest how to increase the voltage VCE when VCC is fixed. (10) 2. Design an operational amplifier with AV = +50 . (10) What is the output voltage when vi = 2 [mV]. (10)

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