The CMOS differential stage with active load intuitively demonstrates the unequal split of the differential input Voltage

The authors propose a new intuitive demonstration-with the help of the Reductio ad Absurdum technique-of one "interesting" feature of the complementary metal-oxide-semiconductor (CMOS) differential stage with an active load, namely, unequal split of the differential input voltage (the gate-source voltage is not equal for the input transistors). This kind of demonstration is very useful for challenging the students' thinking and for developing a "sense" of electronic circuits operation.