3. For the CE circuit with degeneration resistor Re in the following circuit, can be considered very large and the current source be ideal. Do the following: a. Write down the general expression of the small-signal overall voltage gain A.(s) = vo/Vsig that's frequency dependent. Then further find the mid-band gain AM and the low 3-dB frequency fL. b. Show that including Re reduces the magnitude of Am by a certain factor. Figure out the factor. c. Show that including Re also reduces f, by the same factor in b) and thus one can use Re to trade- off gain for bandwidth. d. For I = 0.25 mA, Rc = 10 k2 and CE = 10 uF, find AM and f with R = 0. Now find the value of Re that lowers fi by a factor of 5. What will the gain become? Sketch on the same diagram a Bode plot for the gain magnitude for both cases. Voc Vsig Rc www =