High cutoff frequency can be found in....which of the following....??
a. common base
b. common collector
c. common emitter

Question

High cutoff frequency can be found in....which of the following....??
a. common base
b. common collector
c. common emitter

stormfire1 · Answer

common emitter

anonymous · Answer

@stormfire1 : why dear ? would u explain it plz ?

stormfire1 · Answer

Sorry for the delay...I was working on another problem.  

I honestly don't remember the theory behind it.  However, I'm fairly sure it's correct since I do recall using a formula and Thevinin's Theorem in problems to calculate it...many years ago.

anonymous · Answer

@stormfire1  : as i know cut off frequency is depend on the resistor $$f _{L3db}=1/CR _{eq}$$

stormfire1 · Answer

Yea...I don't remember those formulas.  The classes I took that covered amplifiers were back in 1990 and I've never had to use them since :)

anonymous · Answer

its ok but i need some logic behind it....to be sure about the answer and also it will help me to understand the problem......!!