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TC of Polysilicon Resistor

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vbhupendra

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TC is +ve or -ve for PolySi resistors ?
Art of Analog Layout book says it depends on annealing conditions & it can vary (page no 163).
Does this means it can be +ve or -ve ?
 

vbhupendra said:
TC is +ve or -ve for PolySi resistors ?
Art of Analog Layout book says it depends on annealing conditions & it can vary (page no 163).
Does this means it can be +ve or -ve ?
Click to expand...

Yes. It can be +ve or -ve depending on the poly doping concentration. This is true for unsal resistor. For metal and sal res, TC will be +ve.
 

High resistive Poly-resistor has negative TC,
low resistive Poly-resistor has positive TC.
Poly-resistor having sheet resistance about some hundreds/square have near zero TC.
 

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