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What is the metal resistance found in the design kits?

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safwatonline

safwatonline

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is the metal resistance found in the design kits just a metal line or does it take some special mask from the fab.

i.e. can i use it without any extra option from the fab?
regards
 

metal resistance

just interconnection layer
 

Re: metal resistance

safwatonline said:
is the metal resistance found in the design kits just a metal line or does it take some special mask from the fab.

i.e. can i use it without any extra option from the fab?
regards
Click to expand...

metal can be used as a resistance without any extra option.
But the impedance is too small that we usually use other types of resistances.
The metal resistance is parasitical when it is used as a interconnection line.

Ryan
 

Re: metal resistance

There will be a dummy layer over the metal to tell the LVS tool to identify it as resistance.

Bupesh
 

metal resistance

i know that a dummy layer is added but the question is that wether a special setting is done by the fab. like adding an identification mask.
 

Re: metal resistance

i searched in the documentation of the umc pdk; it tells that the only layer used is metal 1 , it seems that it requires no additional mask, you can simply put it in your schematic for certain value of resistance , then take the dimensions from layout and place a metal with the same dimensions , the run parasitic extraction and see the resistance wether same or differ
 

    safwatonline

    safwatonline

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metal resistance

Since the metal resistance is too small, in what situation will we use a metal resistor in the circuit design?
 

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