Need help on DC Biasing

Thread Starter

BlackMelon

Joined Mar 19, 2015
102
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
 

Attachments

Top