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Temperature compensation for MOSFET?

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srikanth1986

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Hi all,

I'm trying to temperature-compensate the impedance of a MOSFET (That is, trying to make Idrive constant irrespective of temperature variation) and am looking for simple ideas for it. Anything?

If needed, it can be assumed that there is a temperature independent reference voltage.

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Thanks!
 

I'm thinking two thermistor potential dividers?

One sensing the MOSFET temperature and the other a reference. You could feed these into an Op-Amp comparator and then drive the gate of your MOSFET from the output of the Op-Amp.
 
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That's a nice idea Pha5e. May be I can start working on that line.

The problem is that it needs to be a completely on-die solution without external components. Moreover, the circuit needs to be replicated at a number of places and hence needs to be as small as possible. Oh, the tyranny of IC design!

I was thinking if we could use the temperature dependence of Vt in some way.

Thanks.
 

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