(20 points) Having learned about the high voltage gain of the cascode stage, a student adventurously constructs the circuit depicted in Fig. 2, where the input is applied to the

base of Q2 rather than to the base of Q1. (a) Replacing Qi with roi, explain intuitively why the voltage gain of this stage cannot be as high as that of the cascode. (b) Assuming gm ro »1, compute the short circuit transconductance and the voltage gain.