Need help on DC Biasing

Discussion in 'Homework Help' started by BlackMelon, Jun 6, 2016.

  1. BlackMelon

    Thread Starter Member

    Mar 19, 2015
    31
    0
    Hello,

    The problem statement is on the file "Bias Ask". After I've seen this, I quickly draw a small signal model of the whole circuit in the file "small signal ask", which allows me to consider this amplifier as "Series-Shunt" or "voltage to voltage" amplifier.

    The problem is not with the small signal circuit but the DC biasing. I need to know the DC collector current(IC) first so I can determine the "early resistance, ro". I set the vs=0V... And so what's next? How can I determine the IC since the 200uA is not emitter current? Can we consider the op-amp as an ideal one (V+ = V-) in DC biasing?

    Thank you
    BlackMelon
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    Simply assume that Ic is 200μA.
     
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