n+ poly salicide connection (snp_rfb)

[bluesy]

Hi, there are 3 terminal for the resistor where one is minus , another one is plus at two end of the resistor, however, i need to connect the middle terminal to the ground. what should i add to make the resistor connect to ground? i add poly contact for making connection to ground but it doesn't work.I cant pass the LVS. does anyone can help me?? thanks

 

[erikl]

Seems your resistor is on (p-)substrate. So its 3^rd terminal needs a p+ tap (p+ substrate contact).

 

[bluesy]

sorry, i dont really understand. how should i make the routing? is that i add a contact and connect with metal??

 

[Braski]

you have to add a ptap on your p substrate and connect it to gnd. However, your substrate is normally connected to gnd. The third terminal is necessary for parasitics modeling, but is not an "actual" terminal.

 

[erikl]

you have to add a ptap on your p substrate and connect it to gnd.

... and to the 3^rd resistor terminal.

The third terminal is necessary for parasitics modeling, but is not an "actual" terminal.

Correct. For LVS comparison, however, it's necessary to connect it accordingly.

is that i add a contact and connect with metal??

Exactly, and to gnd, too.

 

[bluesy]

is that i just create a instance of ptap into the substrate right? i'm using 0.13um technology but i can't find ptap/ ntap in the library.is that adding M1-Psub? i added it but it still shows not connected properly. what should i do? thank you so much for your help

 

[bluesy]

sorry, i'm still confusing, the model i use is snp_rfb(n+ poly salicide) and is it possible the subtrate of the resistor is P-?? is it n- substrate is for P+ Poly Salicide?

 

[erikl]

the model i use is snp_rfb(n+ poly salicide) and is it possible the subtrate of the resistor is P-?? is it n- substrate is for P+ Poly Salicide?

The doping polarity of poly salicide has nothing to do with the silicon doping below. As Braski has noted above, the 3^rd terminal is just for parasitics modeling, hence it has to be connected with the silicon layer below the resistor. If it is n-substrate -- as you stated above -- (or n-well), connect it with the usual N+ tap which you use for connecting the bulk of your PMOS transistors, perhaps named M1-Nsub (don't know what's its name in your process). If the resistor lies over p-substrate, connect it with the usual P+ tap which you use for connecting the bulk of your NMOS transistors, perhaps named M1-Psub as you stated above.

HTH! erikl