I'm stuck on the part b of this tutorial question. I thought I understood the theory, but I can't get the right answer.
For part a I got: Af(jw) = 10^3 * jw / (3jw + 200)
From my understanding, the formula I should use for part b is:
Af = s*Am / (s + wL), where Am is the mid-high frequency gain and wL is the lower 3dB frequency.
However this gives me an Am of 10^3 and a wL of 200, which doesn't match the answers.
If anyone could show me where I've gone wrong I'd be extremely grateful.
Edit: I've realized part of my mistake. I'm looking for the NEW Am and wL, meaning the values for when I include feedback. According to my notes I should find the original values from A(s) using the formula: A(s) = sAm / (s + wL). So this gives me Am = 10^3 and wL = 200.
Now I need to find the new Am using this formula: Midband gain = Am / (1 + Am*B). This gives me 333.3, which is the correct answer.
Next formula I am supposed to use: wfL = wL / (1 + AmB), where wfL is the new value for wL now that feedback is included. I used 200 as my value for wL and 0.002 as my value for B. I tried both 10^3 and 333.3 as values for Am, giving me wfL = 66.7 and wfL = 120. I still cannot get the right answer for wfL; the answer is supposed to be 10.61Hz.