OpAmp homework help please

Thread Starter

¥öK'žy

Joined Mar 27, 2008
19
Hello Everyone, Can anyone help me please for this homework....
Below I attached the schematic diagram of OpAmp.
My question here is, what is the rule of the Transistor Q3,Q4,Q6, and Q7.
My first thought, it was for active load, but I don't know what they're use for. Am I correct??
 

Attachments

Thread Starter

¥öK'žy

Joined Mar 27, 2008
19
Thanx for the reply bertus, I also found that the current mirror is well described in AAC book vol 3. (I miss that before..).
And what about the transistor Q3 and Q4? is it Darlington?
 

Ron H

Joined Apr 14, 2005
7,063
¥öK'žy;76583 said:
Thanx for the reply bertus, I also found that the current mirror is well described in AAC book vol 3. (I miss that before..).
And what about the transistor Q3 and Q4? is it Darlington?
Q3 and Q4 are current amplifiers.
 
Top