Common Mode Differential Amplifier

[peace_lp]

Hi,
does anyone know what are the 4 different cases in a common mode differential amplifier?
thanks a lot for all of your help.

thanks,
peace

[berkeman]

Well, "common mode differential amplifier" is an oxymoron. It contradicts itself. Quiz question -- why is it an oxymoron?

Could you please restate the question?