Lower and upper cutoff frequencies

[aruna1]

Homework Statement

i have values of input signal frequencies and relevant voltage gains(A_v) of a amplifire.and i want to find upper and lower cutoff frequencies by drawing a graph.can someone tell me how to find upper and lower cutoff frequencies with following values.
thanks

here is values



http://img227.imageshack.us/my.php?image=valueskc2.jpg

 

[wildman]

the cutoff frequency is the -3 db point (squareroot of 1/2 of the passband voltage). Take the highest point and assume that is the zero gain point and go down -3 db. You'll have to Interpolate between some values.

 

[aruna1]

the cutoff frequency is the -3 db point (squareroot of 1/2 of the passband voltage). Take the highest point and assume that is the zero gain point and go down -3 db. You'll have to Interpolate between some values.

can you please explain this with given values? i mean with gains given.thanks