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how to choose resistor

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liucheng311

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dear all:
i am designing a current reference(PTAT),but i dont know how to choose the resistor .there are so many kinds of resistor supported by the foundry,polyres,Pbaseres,etc.a few of them are low precise,but many of them have precision of 10%,i am confused about choosing,is there any advice??
 

I'd use that one with the lowest TC resp. VC -- probably polyres.

If you have resistors with pos. and neg. TCs available, you could add them appropriately to achieve a very low TC -- or even (nearly) compensate the PTAT TC -- if this is wanted.
 

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