Stats

  • Locked Locked
  • Replies 12
  • Subscribers 128
  • Views 6069
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

IC6 constraining/placing matched transistors

stuso

Hi there,

Is anyone aware if its possible to constrain the placement of transistors for matching such that you can dictate the order of devices and the layer used to space them.

For example i have a schematic with 3 mos device, all of same w/L and 1 finger and 2 multiples.

Schematic:

nm1 m(multiple)=2, nm2 m=2 , dummy1 m=2

I want layout to place/constrain these to align and equally space as:

dummy1.1    nm2.1     nm1.1     nm1.2    nm2.2     dummy1.2

so for example there is polygon in each pcell called OD which i would like NOT to overlap AND be spaced by 1um, so the layout looks like 6 transistors in a line with the OD layers spaced by 1um.

Its basiaclly a simple current mirror with nm1 the bias device in the centre, nm2 split either side & dummy on either end. For matching all 6 units are equally spaced.

Thanks

Stu

 

Parents

  • Hi Stu, 

    I have been meaning to send you couple of pointers to some video demos posted in Sourcelink, under 'Design Topics' (Custom IC Physical Implementation) but had run into some technicalities. If you are familiar with the Design Topics page, it is probably easy for you to navigate and find these video demos but just in case, here is the link. I don't know if the link will work for sure, if not let me know.

    Specific to Modgens: 

    http://sourcelink.cadence.com/en/search/DisplayHtmlDoc.jhtml;jsessionidsl=K5HAYRALSPQ55LA0BEBCFEQ?param1=http://sourcelink.cadence.com/docs/DTSL/cic_phys_impl/modgenDemo1_index.htm?param2=null?param3=Demos?param4=0?param5=/software/cadence/sldocs/DTSL/cic_phys_impl/modgenDemo1_index.htm@dtsl_en_col?param7=Introduction%20to%20Using%20%3Cb%3EModgens%3C/b%3E%20in%20a%20Front-to-back%20Flow

    The Constraint Driven Flow in general: 

     http://sourcelink.cadence.com/en/search/DisplayHtmlDoc.jhtml;jsessionidsl=K5HAYRALSPQ55LA0BEBCFEQ?param1=http://sourcelink.cadence.com/docs/DTSL/cic_phys_impl/CDNTechDemo_index.htm?param2=null?param3=Demos?param4=0?param5=/software/cadence/sldocs/DTSL/cic_phys_impl/CDNTechDemo_index.htm@dtsl_en_col?param7=Constraint%20Driven%20Physical%20Design:%20A%20Front%20to%20Back%20Flow

    Hope you find this useful ... Thanks, 

    -Sravasti

Reply

  • Hi Stu, 

    I have been meaning to send you couple of pointers to some video demos posted in Sourcelink, under 'Design Topics' (Custom IC Physical Implementation) but had run into some technicalities. If you are familiar with the Design Topics page, it is probably easy for you to navigate and find these video demos but just in case, here is the link. I don't know if the link will work for sure, if not let me know.

    Specific to Modgens: 

    http://sourcelink.cadence.com/en/search/DisplayHtmlDoc.jhtml;jsessionidsl=K5HAYRALSPQ55LA0BEBCFEQ?param1=http://sourcelink.cadence.com/docs/DTSL/cic_phys_impl/modgenDemo1_index.htm?param2=null?param3=Demos?param4=0?param5=/software/cadence/sldocs/DTSL/cic_phys_impl/modgenDemo1_index.htm@dtsl_en_col?param7=Introduction%20to%20Using%20%3Cb%3EModgens%3C/b%3E%20in%20a%20Front-to-back%20Flow

    The Constraint Driven Flow in general: 

     http://sourcelink.cadence.com/en/search/DisplayHtmlDoc.jhtml;jsessionidsl=K5HAYRALSPQ55LA0BEBCFEQ?param1=http://sourcelink.cadence.com/docs/DTSL/cic_phys_impl/CDNTechDemo_index.htm?param2=null?param3=Demos?param4=0?param5=/software/cadence/sldocs/DTSL/cic_phys_impl/CDNTechDemo_index.htm@dtsl_en_col?param7=Constraint%20Driven%20Physical%20Design:%20A%20Front%20to%20Back%20Flow

    Hope you find this useful ... Thanks, 

    -Sravasti

Children
No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.