Hi all,

I'm using an ADL5391 down to DC. The output offset voltage is adjusted to exactly 0 using the Z input.

Now there is still some offset as a function of temperature for which I would like to make compensation circuit.

The data sheet of th ADL5391 shows a positive temperature coefficient for the offset voltage (figure 11).

Is the slope of this graph always positive and equally steep, or does this figure just show the worst case. In other words: can I use a fixed compensation in order to counter for the temperature dependancy?

Thanks,

Paul

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Hi Paul,

Figure 11 is the average DC offset for X and Y inputs over temperature, so if you used that average slope and intercept you will probably correct for a lot of the temperature variation, but you won't get rid of all of the variation for every single part due to part-to-part variation. You would basically have to calibrate each and every part to get rid of all temperature variation for all parts.

Regards,

Joel