I have circuit drawn in AC, they were 2 cascaded BJT transistors, and I have changed them to the hybrid pi model. I wish to remove the source and load in order to write a general gain equation for each hyrbid pi model itself, so I can re-draw them both as amplifier models.
In order to do this, I need to know across which element is Vout for transistor 1?
The upper image shows the original circuit, I know that the DC VCC is now set to zero therefore ground.
I know that in a figure "Vout" will be where ever they have indicated the name with respect to ground. It appears to me that Q1 Vout would be zero if Vout is from the collector node to the ground as they are the same node
1) When cascading is the second transistors Vinput = the first transistors Vout? (this is my hunch but I am not convinced)
2) How do I find Vout in this example?