From what I understand a saturation for an BJT is when the B-E voltage doesnt change the collector current anymore. In other words, Saturation simply means that an increase in base current results in no (or very little) increase in collector current. However, the section for Saturation in the graph is when the current and voltage rise almost linearly together for a fixed base current. Isnt this contradicting? Shouldn't the slope be somewhat similar to the 'active region' and be flat?
I meant if we change B-E voltage, the collector still should be the same. Am I missing something here? Thanks
Best Answer
In the graph you presented, the x-axis is \$V_{ce}\$, not \$V_{be}\$. Changes in \$V_{be}\$ are represented by jumping from one parameterized curve to another.
You can see in the saturation reason, the parametric curves overlap, meaning changing \$V_{be}\$ doesn't result in a change in collector current, just as stated in your proposed definition.