전자회로(기말 고사 문제지)2012-2
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This document is an exam for an electronic circuits course from December 10, 2012. It contains 6 questions regarding a CE amplifier circuit, including calculating the Thevenin equivalent circuit for the base, determining the bias conditions, drawing the hybrid-Pi model, calculating the AC gain, finding capacitor impedances at 1 kHz, and suggesting how to increase the output voltage. It also contains a question about designing an op-amp with a gain of 50 and calculating the output for a 2 mV input.
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![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)](https://image.slidesharecdn.com/testec20122-131016012052-phpapp01/85/2012-2-1-320.jpg)
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전자회로(기말 고사 문제지)2012-2
- 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)