Hi, this is the original circuit:
They ask me to calculate the corner frequency using the open-circuit time-constant method assuming ro->infinity and rb =0. The previous question asked to draw the small signal equivalent circuit for high frequency AC analysis. So I assumed from this circuit, I could reduce it into a simpler form:
I don't understand why R1 has disappeared...
Thanks.
They ask me to calculate the corner frequency using the open-circuit time-constant method assuming ro->infinity and rb =0. The previous question asked to draw the small signal equivalent circuit for high frequency AC analysis. So I assumed from this circuit, I could reduce it into a simpler form:
I don't understand why R1 has disappeared...
Thanks.