The mid-band equivalent circuit of a single-stage common-emitter NPN BJT amplifi

Question

The mid-band equivalent circuit of a single-stage common-emitter NPN BJT amplifier is shown in Figure 378. Pertinent model parameters and d.c. bias for Q, are given below. Beta f = 65.0 VA = 50.0v Vce = 12.0 v Assuming that these values remain constant over a wide range of d.c collector current, you are asked to do the following: Derive an expression for the small-signal mid-band source voltage gain An as a function of the d.c. collector current Use the values of the components given on live schematic and the parameters given above in your expression with Ic, as a variable. Recall that An is defined as n(Ic) = Vo/Vs=f(Ic) Use your expression derived in pan (a.) to calculate the valucof Ic that will maximize the magnitude of An. Calculate the value of the voltage gain for this current and indicate why its magnitude is the maximum. CE Amplifier Equivalent Circuit

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