However, every time I see this, all three resistors are the same values! From Forest Mims, to op-amp app-notes. When I run the simulations in LT-Spice the equal value version has the lowest Vos, followed by R3 = R1||R2 followed by direct connection to ground.
So my question(s) are:
- Why use this topology instead of a simple follower (no resistors), when the op-amp is unity gain stable.
- All the academic texts say to use the parallel equation for the value of R3, but I never see it in the wild. Why?