The transistor amplifier circuit shown below has Rgig = 47 N, Rg = R1 = 4.63 kn, RE = 6.84 kn, Vec = 7.5V, VẸE = -7.5 V, and 8 = 169. %3! (a) Is this a Common-Emitter, Common-Collector, or Common-Base amplifier? (b) Find the DC bias current Ig. (c) Draw the AC small-signal equivalent circuit using the T-model of the transistor. Ignore the effect of r. (d) Find the overall voltage gain Usig Vcc Rc + RL Vo sig + RE Vin Vsig O IE VEE

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Multistage Amplifier

The multistage amplifier is generally a voltage or power amplifier. The multistage amplifier has a number of single stage amplifier that are cascaded together. Since a single stage amplifier output is not useful, they are being replaced with multistage amplifiers or multistage transistor amplifiers. The multistage amplifier are used where the gain required is high or the input signal is very small such that only a single stage amplifier cannot amplify it.