hi all

we use circuit parameters(i.e h ,y , z etc.) to break a feedback circuit into its a&b circuits . but all these parameters require 2input , 2 output systems . how can we break a feedback resistance into a&b circuit when it is connected between collector and base of the circuit in a simple bjp amplifier.

thanx
plz reply

 

explain what an a and b circuit are.
i understand bjt's but i have never heard the alpha labels before.