Suppose, in Fig. 25.19, that instead of the two input sine waves being connected to ground they are tied (together) to a common mode signal (say a noise voltage). Show that a common mode signal (like...

Suppose, in Fig. 25.19, that instead of the two input sine waves being connected to ground they are tied (together) to a common mode signal (say a noise voltage). Show that a common mode signal (like a sine wave) won't change the circuits' output signals. The amplitude of the common-mode signal shouldn't be so large that the NMOS switches shut off.