Evaluate av for the case va 5 v and beta 50 note that

Question

8.78 Consider the BJT cascode amplifier of Fig. 8.38 for the case all transistors have equal β and ro. Show that the voltage gain Av can be expressed in the form

Evaluate Av for the case /VA /= 5 V and β = 50. Note that except for the fact that β depends on I as a second-order effect, the gain is independent of the bias current I!