Using the topology seen in Fig. 25.13a and the SPICE op-amp model in Fig. 25.18, show how both V in and V CM can be varied while the op-amp's inputs are equal, that is, v p  v m. Is the output...

Using the topology seen in Fig. 25.13a and the SPICE op-amp model in Fig. 25.18, show how both V_in
and V_CM
can be varied while the op-amp's inputs are equal, that is, v p
 v m. Is the output common-mode voltage always at V_CM
using the simple SPICE model for the fully-differential output op-amp in Fig. 25.18? Why or why not? Give an example supporting your answer.