What's the difference between a OD NWELL resistor and a STI NWELL resistor?

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diemilio

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Hello everyone!!

Can anyone tell me what's the difference between a OD NWELL resistor and a STI NWELL resistor??? What does OD and STI stand for???

Thanks

diemilio
 

Re: NWELL RESISTOR

OD stands for the thin oxide region or active area.

STI stands for shallow trench isolation (opposite of OD)

In an OD NWELL resistor the resistor is formed in an active area. In the case of an STI NWELL resistor it is formed under the STI oxide.

The models for these two resistors will be different since they will have differnt diffusion profiles and be contacted different. The OD resistor most likely has a silicide block mask also to keep silicide from forming on top of the OD region.

DrProf
 
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