About the offset voltage tempterature drift of the OPA

[name_windy]

Hello everyone

I am designing a bandgap recently, and i want to know something about the offset voltage tempterature drift of the OPA.
Can anybody help me?

Thanks a lot!

windy

 

[elbadry]

I think there is not much to say. The offset voltage depends on the random mismatch between the Opamp's input pair transistors. This random mismatch is a function of temperature making the offset itself temp dependent and hence ruining the compensation that was done with no offset or constant offset assumption

 

[name_windy]

Thank you for your reply, elbadry.
And i just want to know the magnitude of the offset voltage tempterature drift. how much will it change as the tempterature? several mV or uV?

 

[analog_007]

I also want to know this.

Thanks!

 

[kalaianand]

offset voltge change is specified by the manufacures in the datasheet in ppm/C