Ignoring early effect, if R1 is the total resistance connected to the base and R2 is the total resistance connected at the collector, what could be the approximate input pole of a simple C.E. stage?
(a) 1 / [R1 * (Cµ(2+gm*R2) + Cπ)]
(b) 1 / [R1 * (Cµ(1+2*gm*R2) + Cπ)]
(c) 1 / [R1 * (Cµ(1+gm*R2) + Cπ)]
(d) 1 / [R1 * (Cµ(1-gm*R2) + Cπ)]
The question was asked in exam.
My doubt is from Effect of Various Capacitors on Frequency Response topic in chapter Transistor Frequency Response of Analog Circuits