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ADA4528 offset voltage thermal stability

Question asked by Gioacchino on Jan 19, 2018
Latest reply on Jan 22, 2018 by Gioacchino

Hello,

ADA4528 datasheet says that the input voltage offset has a TEMPCO of 0,015uV/°C.

 

How TEMPCO is measured? Is the temperature rate of change relevant?

 

I developed an amplifier, based on ADA4528, that exhibits higher offset voltage than expected. I know that a bad dimensioning (bad resistor choice for example) can affect the device performance. Unfortunately I cannot make my circuit public so I cannot post a picture here.

 

I simulated the circuit, using the ADA4528 spice model, and found a quite lower offset voltage. The simulated value is in accordance with the one I calculated.

 

Any suggestions?

 

Ragards, Gioacchino

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