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convertion multi striped devices to multiple instances

dwaraka

 I have mosfets and resistors placed as multi striped devices in schematic. I want to convert it to mulple instances.

for example

if the schematic has a nmos with width 100u and 10 stripes, I want it to be changed as 10 different instaces of 10u width connected in parallel.

And if there is a resistor with length 50u of 5 stripes, after the conversion it should have 5 resistors, each of length 10u length, connected in series.

Could any one please help me in writing a skill script for this.

Thanks

 

Parents
  • dwaraka
    Hello Andrew,

    Stripe means finger of the device. (For example, If a mosfet has 100um width, we can devide this to multiple fingers whose width adds up to 100)

    The purpose is to make sure that the number of fingers in layout and schematics are same. If we are starting the layout from scratch, we can make use of all these features of XL etc. For a design which is already been laid out, if I need to check the correctness of number of fingers, there is no way with the verification tool (Hercules) we are using. We can overcome the limitation of the tool if it gets a netlist with multi fingered device netlisted as multiple devices. In this case if I specify not to merge the parallel mos or series resistors, the tool look for the schematic equivalent for each stripes of layout devices. Otherwise when it merge parallel or series devices it will have only the info of total size of the device, will not have any information of number of fingers. I am not going to use this netlist for any simulation, it is just for the lvs verification.

    Please let me know if you need any more info.

    Thanks,
    Vijith
Reply
  • dwaraka
    Hello Andrew,

    Stripe means finger of the device. (For example, If a mosfet has 100um width, we can devide this to multiple fingers whose width adds up to 100)

    The purpose is to make sure that the number of fingers in layout and schematics are same. If we are starting the layout from scratch, we can make use of all these features of XL etc. For a design which is already been laid out, if I need to check the correctness of number of fingers, there is no way with the verification tool (Hercules) we are using. We can overcome the limitation of the tool if it gets a netlist with multi fingered device netlisted as multiple devices. In this case if I specify not to merge the parallel mos or series resistors, the tool look for the schematic equivalent for each stripes of layout devices. Otherwise when it merge parallel or series devices it will have only the info of total size of the device, will not have any information of number of fingers. I am not going to use this netlist for any simulation, it is just for the lvs verification.

    Please let me know if you need any more info.

    Thanks,
    Vijith
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