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Problem with netlist extraction in Mentor Graphics

Hello Everyone, I am facing a problem with extracting the netlist from the mentor graphics. I am using IC station to build my layout (currently having an inverter with a signal conditioner and load). When I extract the netlist using PEX, I get the following (Only a part of it is shown below)

------------------------------- mM0 IN IN1 VDD VDD P L=4e-07 W=1.8e-06 AD=2.16e-12 AS=2.16e-12 PD=6e-06

  • PS=6e-06 NRD=0.222222 NRS=0.222222 mM1 OUT IN VDD VDD P L=4e-07 W=1.8e-06 AD=2.16e-12 AS=2.16e-12 PD=6e-06
  • PS=6e-06 NRD=0.222222 NRS=0.222222 mM2 OUT2 OUT VDD VDD P L=4e-07 W=1.8e-06 AD=2.16e-12 AS=2.16e-12 PD=6e-06
  • PS=6e-06 NRD=0.222222 NRS=0.222222 mM3 IN IN1 GND GND N L=4e-07 W=1.2e-06 AD=1.44e-12 AS=1.44e-12 PD=4.8e-06
  • PS=4.8e-06 NRD=0.333333 NRS=0.333333 mM4 OUT IN GND GND N L=4e-07 W=1.2e-06 AD=1.44e-12 AS=1.44e-12 PD=4.8e-06
  • PS=4.8e-06 NRD=0.333333 NRS=0.333333 mM5 OUT2 OUT GND GND N L=4e-07 W=1.2e-06 AD=1.44e-12 AS=1.44e-12 PD=4.8e-06
  • PS=4.8e-06 NRD=0.333333 NRS=0.333333 c_1 1 0 1.1728f c_2 2 0 2.1136f c_3 3 0 2.1136f c_4 4 0 3.0023f c_5 5 0 3.0537f c_6 6 0 0.7216f

--------------------------------- In the layout I had 4 ports namely IN, IN1, OUT, OUT2.

IN and OUT are the ports of the inverter under consideration. IN1 is the input to the signal conditioner OUT2 is the output at the load.

(Signal conditioner and load are similar inverters) You can see from the netlist, that the capacitors are given as between

1 & 0, 2 & 0 and so on. Its not saying between which ports and ground or another port with naming them as IN, IN1 etc.

----------------------------------- When I run "eldo" it gives me these warnings:

Warning 112: NODE "1": Connected to grounded capacitors only. This node has been removed from the netlist. Warning 112: NODE "2": Connected to grounded capacitors only. This node has been removed from the netlist. Warning 112: NODE "3": Connected to grounded capacitors only. This node has been removed from the netlist. Warning 29: Set .option MSGNODE = 0 to receive all such warnings.

------------------------------------ I suspect that the netlist generated has the errors (which might be due to the layout, I am not sure about this). If the Ports are mentioned in the netlist for capacitors, these warnings wont appear. Can anyone help me why it is generating this way?

Thanks in Advance, Ranjith

Reply to
Ranjith
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Since this is the layout I am starting with (a simple one), I can do this manually. What will happen when i have to do this for a huge circuit?

Reply to
Ranjith

This is Ranjith for forever:

I think the netlist generator doesn't "see" the node _names_ and connect the capacitors to a node _number_.

If you can edit the output netlist manually, you may wish to change the node names of capacitors.

[]s 
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Reply to
Chaos Master

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