Let's design a differential amplifier (like what's inside an op-amp) using transistors. Let's do a full derivation and see why current source biasing can be advantageous over resistor biasing with the differential amplifier. We will derive the differential mode gain and the common mode gain.
Aaron Danner is a professor in the Department of Electrical and Computer Engineering at the National University of Singapore.
https://danner.group
Video filmed and edited with help of CIT, NUS.