substrat contact in std cell

[amitabh262002]

Hi
i am delevloping std cell library.
can any one tell me how to give substrat connection to any Gate like AND...

---------------------------------------------VDD
PMOS
NMOS
-------------------------------------------------VSS
this is my rough representation of a cell,pls tell me where shoud i give substrat connections.

 

[cmos_dude]

You can try putting them right under the VDD and VSS supply rails. That ways, you can save a lot of space!!!

--cmos_dude

 

[stuck_adc]

p substrate can be given below the VDD rail while the n-substrate can be placed below the VSS rail, this is the most preferred way.
This saves a area also.