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Process invariant PTAT current source

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stamford

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Hi all,
I'm using a PTAT current source to compensate the temperature dependence of my OTA-C filter. I was able to get Current proportional to temperature but the problem I'm facing is, the variation over process corners is too much.
Is there any way I can design a PTAT current source that doesn't (or vary less) with process, prefarably not using a resistor, because resistors vary even more with process.


Any help would be precious
 

Can't make a PTAT without a resistor.

A trimmed resistor is process invariant, in the end. But you
pay a cost in area and test time to get there.
 

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