Differential Amplifier

Discussion in 'Electronics Homework Help' started by Ungen, Aug 4, 2018.

  1. Ungen

    Ungen

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    I have big problems understanding this problem. It's an earlier exams assignment.
    I think my biggest problem is that I don't understand how the configuration on Q2 works. Looks for that the Q2 base get 0 volt..
    Think a better translation on the last question might be " current source ".

    Thanks in advance for any tips or solution.
    Regards
    Anders
     

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    Ungen, Aug 4, 2018
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  2. Ungen

    LvW

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    I think, you have no other chance than to assume for both transistors a biasing DC voltage between base and emitter of Vbe=(0.65...0.7) volts. The exact voltage is not known and is not too important because of of the negative feedback effect of Re. Starting with such an assumption it shouldn`t be a problem fpr you to calculate the quiescent DC current through the transistors (can be assumed to be equal).
     
    LvW, Aug 5, 2018
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  3. Ungen

    Kabelsalat

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    For the question D (the printed part not translated) it says that the 8.2kΩ resistor is switced by a current source.

    btw. It's a bad practice not to labeling all components, as the resistors (that is to blame the assignment paper).
     
    Kabelsalat, Aug 5, 2018
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  4. Ungen

    Ungen

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    Thanks
     
    Ungen, Aug 6, 2018
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