What will the gain become

Reference no: EM131019481

The BJT common-emitter amplifier of Fig. includes an emitter-degeneration resistance Re

(a) Assuming α?1, neglecting ro, and assuming the current source to be ideal, derive an expression for the small-signal voltage gain A(s) ≡ Vo/Vsig that applies in the mid band and the low-frequency band. Hence find the midland gain AM and the lower 3-dB frequency fL.

b) Show that including Re reduces the magnitude of AM by a certain factor. What is this factor?

(b) and thus one can use Re to trade off gain for bandwidth.

(d) For I = 0.25 mA, RC = 10 kΩ , and CE = 10 μF, find / AM / and fL with Re = 0. Now find the value of Re that lowers fL by a factor of 10. What will the gain become? Sketch on the same diagram a Bode plot for the gain magnitude for both cases.

Reference no: EM131019481

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