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why p+ poly resistors are preferred over n+ poly resistors?

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kapilsn

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N+ and P+ poly resistors

when we say that it is a n+ poly resistor ,do we mena that the poly is doped with n+.??
Also can anyone tell me why it is said that p+ poly resistors are preferred over n+ poly resistors.
 

erikl

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Re: N+ and P+ poly resistors

kapilsn said:
when we say that it is a n+ poly resistor ,do we mena that the poly is doped with n+.??
Yes.
kapilsn said:
Also can anyone tell me why it is said that p+ poly resistors are preferred over n+ poly resistors.
Because generally p+ poly resistors have a lower TC1 (but their VC1 mostly is larger than that of n+ poly resistors).
 

survivor

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Usually the sheet resitance of p+ poly is larger than n+ poly. That helps when you try to save area.
 

neoflash

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Re: N+ and P+ poly resistors

kapilsn said:
when we say that it is a n+ poly resistor ,do we mena that the poly is doped with n+.??
Also can anyone tell me why it is said that p+ poly resistors are preferred over n+ poly resistors.

Check with foundry's mismatch report and you will know the answer.
 
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