4 ms·
I've seen designs that use a Chopper Op-Amp to actually auto-zero a power-OpAmp, effectively transferring the low Vos characteristics to a different OpAmp with
by dragontamer 2y ago
I've seen designs that use a Chopper Op-Amp to actually auto-zero a power-OpAmp, effectively transferring the low Vos characteristics to a different OpAmp with completely different characteristics.
- kragen 2y agoIf the op-amp has a stable Vos I feel like maybe you could zero it by hand with a trimpot? You just need a button to short the inputs together while you're trimming it.
- dragontamer 2y agoThis is necessary because Vos is often a voltage dependent inaccuracy. So as your circuit functions it's Vos is changing up and down.
- kragen 2y agoYes, if the opamp doesn't have a stable Vos, you probably can't do a very good job of zeroing it with just a trimpot.