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layout tricks in standard cells

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drabos

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I am just wondering why in many standard cell library in an inverter layout the gate is not straight rather like a snake. What is the advantage of this structure???
 

pit1000

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In technologies with silicide use of snake shaped gates allows to save the area due to reduction of the areas of a source and a drain and accordingly to reduce parasitic cap.
 

    drabos

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MSSN

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I think they do so to be able to compact the area as much as possible without violating the layout design rules
 

    drabos

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leohart

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Hi all
How does this snake look like?
 

fixrouter4400

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the reason why they use an angle polysilicon layer..to save area but this is allowed only to a short as possible poly bent to minimise the risk of current leakage.
 

    drabos

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leohart

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FT...I was wondering why an inverter use snake-like gate...Did drabos talk about an inverter or a poly resistor?The latter case is common,I just cannot image a snake-like-gate inverter...
 

drabos

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inverter

yeah, I can't imagine why, too.
 

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