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Step 1 of 7 9.054P Refer to P8.61 in the (a) Draw the differential amplifier with notations Rc Rc av, = Rc + = Rc 2r, 2r, e Vid 2r, I Figure 1 Step of 7 Calculate the emitter half circuit of amplifier The expression for small signal emitter resistance 2 2V, The expression for the small signal emitter current is, 2r, Calculate the expression for collector current Step 3 of 7 Calculate expression for output voltage av, 2r, Calculate small signal voltage av, 2r, a Therefore, the expression for small signal voltage gain differential 2r, Step (b) As cascade of a common-collector stage & common-base stage Q2 Draw the cascaded circuit Vcc Rc - C C B B + E E I Figure 2 Step Draw the small signal equivalen circuit of Figure 2. - Rc 0V C, - + C2 10 v, r. E2 Figure 3 Step Apply law bottom loop Apply Kirchhoff current law node Rc Step Calculate expression for output =a 2r, Calculate the small signal voltage gain a 2r, a 2r, the expression for small signal voltage gain o of cascaded amplifier