I'm trying to analyze the small signal model of this following snippet circuit (all the transistors are the same with beta = 100, and VA =100:
What i've come up with is:
simulate this circuit – Schematic created using CircuitLab
when the rest of the circuit is located 'above' the left part. I want to analyze what is the net resistance the the rest of the circuit 'sees', But I got stuck..
I can't figure out how to account for the current sources.
The rightmost current source, is just a resistor of 1/gm (I think), but what about the left one?