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What exactly is the difference between the resistors?

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yitch

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What is the difference between
1.pplus_s
2.pplus_u
3.ppolyf_u
4.ppolyf_s

thanks!

I am using the chartered 0.18um library if it's any help. And how can I model to get the resistor characteristics... thanks! I would really appreciate if anyone can help or just help to rephrase the question cos I am not quite sure what I am asking is a valid question :cry:
 

Hi deepak

Thanks for the reply...

I am sorry though I cannot seem to find any literature on what unsilicied and silicied means. ( I am terribly sorry, I am an undergrad who is really bad at engineering) could you point me out in the right direction as to which journal or book to read to have a better understanding? And would you know what is the difference between plus and poly?

Thank you so much!:D
 

yitch said:
... what unsilicied and silicied means.
Click to expand...
For resistors, unsilicided means high specific resistance, silicided means low specific resistance. For more info pls. s. the PDF below.

yitch said:
And would you know what is the difference between plus and poly?
Click to expand...
nplus or pplus resistors use the resistance of doped regions with the same name, poly resistors use the polysilicon (gate) material; all are available unsilicided or silicided.

And all of them possess different TCs (temperature coefficients)!
 

    Y

    yitch

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A silicide is a compound that has silicon with more electropositive elements.Silicon is more electropositive than carbon. Silicides are structurally closer to borides than to carbides.
 

hi

for unsiliced resistor we have extra layer like SAB in umc tc.., my question is by default the resistor is siliced.
 

siddharth1501 said:
hi

for unsiliced resistor we have extra layer like SAB in umc tc.., my question is by default the resistor is siliced.
Click to expand...


By defaults , all your poly and diffusion layers are silicided .. SAB is Silicide Area Block .... which blocks the Silicidation of poly or diffusion in that area.. thus giving more resistance per unit lenght as compared to silicided one....

Deepak
 

hi deepak

SAB IS Silicide Area Block . WAT ABT SBLK IN ESD.SAB AND SBLK BOTH ARE SAME OR DIFFERENT. WAT ABT FUNCTIONALITY OF SAB AND SBLK IN RESISTOR N ESD .IS IT SAME
 

siddharth1501 said:
hi deepak

SAB IS Silicide Area Block . WAT ABT SBLK IN ESD.SAB AND SBLK BOTH ARE SAME OR DIFFERENT. WAT ABT FUNCTIONALITY OF SAB AND SBLK IN RESISTOR N ESD .IS IT SAME
Click to expand...
depends on your process ....

sumtime they use different blocking layers like RPO for resistor and SAB for MOSFETs ( in ESD) /.. names really depends on foundry but basic functionality is same..
for more information about this layer you can refer your design rule document.
 

so u mean functionality is same for both...........ok thanks for ur help
 

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