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About the offset voltage tempterature drift of the OPA

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name_windy

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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

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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

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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?
 

kalaianand

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

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