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subtract contact (subc) in 0.13um process ibm8rf kit

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Alvaro Camacho Mora

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Hello! I need help I'm new in 0.13 um process using ibm8rf kit. In my first circuit and layout, I made a logic inverter. However this inverter working successfully in the schematic, but in the layout I have a big problems because the subtract mask don't connect with the transistor and I don't know if this form of connection is correct. In the adjust file, I show an image of my schematic. I use mentor graphics.
Thanks.
 

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deepsetan

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Hi,

Bulk for NFET/NMOS should be connected to GND. Bulk for PFET/PMOS should be connected to VDD. I don't think you really need that resistors.

INVERTER.png
 

Dominik Przyborowski

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subc is used only to connect bulk of nfets to ground. pfets has bulk connected directly to the vdd or source.
 

Alvaro Camacho Mora

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Thanks. Yes, I understand this. But, when I want to create the layout, I pressed in "Auto peak and place" and then I create the connections between the transistors. The connections between the bulk and vdd/gnd don't be create. Next I have problems in LVS because the bulk isn't connect, appear one black box. And other question, in the schematic, the connections in nfet with subc, is ok?

Thanks.
 

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