01-12-2012, 05:00 PM
DC and Small Signal Analysis
1DC and Small Signa.ppt (Size: 310.5 KB / Downloads: 164)
Input Stage
The differential pair, Q1 and Q2 provide the main input
Transistors Q5-Q7 provide an active load for the input
Second (Intermediate) Stage
Transistor Q16 acts as an emitter-follower giving this stage a high input resistance
Capacitor Cc provides frequency compensation using the Miller compensation technique
Output Stage
Provides the opAmp with a low output resistance
Class AB output stage provides fairly high current load capabilities without hindering power dissipation in the IC
Short Circuit Protection
These transistors are normally off
They only conduct in the event that a large current is drawn from the output terminal (i.e. a short circuit)
Conclusions
The 741 is a versatile opAmp that can be used in a multitude of different ways
When you break it down into the different components, it’s operation is actually understandable and comprehendible