• Skip to main content
  • Skip to search
  • Skip to footer
Cadence Home
  • This search text may be transcribed, used, stored, or accessed by our third-party service providers per our Cookie Policy and Privacy Policy.

  1. Community Forums
  2. Custom IC Design
  3. Resistor label/pin problem

Stats

  • Locked Locked
  • Replies 1
  • Subscribers 125
  • Views 2624
  • 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

Resistor label/pin problem

archive
archive over 17 years ago

    Hello.

I'm having problems getting Cadence Virtuoso to recognise a resistor in my layout is actually a resistor. To try and solve this I've started with the most simple resistor (see attached resistor.jpg). As you can see this is a simple poly1 resistor with metal 1 connections at each sides. I have placed pins in the bottom left corner of the left hand side contact and also the bottom left corner of the right side contact. These two pins are (imaginatively) called Pin 1 and Pin 2 respectively.

In my schematic I have a simple poly1 resistor for the library and I have connected one resistor contact to a vdd! pin and the second side of the resistor to a pin called 'TRANS'. In reality this resistor is actually a resistive heater, the voltage is supplied by a Power Transistor however at present tthe the vdd! line and power transistor position are not yet decided hence the pins.

In the 0.35um technology the user has to used the RESDEF layer to define the resistor area and also use  RESTRM (why you have to use this layer is so far unclear to me). However I have 100% certain I followed the resistor design rules given by AMS for 0.35 um technology.

When I run DRC I get the errors shown in DRCerrors.jpg

I know the origin of all the listed errors except for the label/pin is on a net with a different name. To clarify I know what this error means however I dont understand why I get it.

So in short how do I solve these problems?

Many thanks,

James


Originally posted in cdnusers.org by jgrant3
  • Resistor.jpg
  • View
  • Hide
  • Cancel
  • archive
    archive over 17 years ago

    An update.

    I've been experimenting with a poly2 resistor from the AMS library. I run DRC on the cell and no label/pin problems. Then I changed the poly2 layers to poly1 layers and ran DRC again. This time I get the label/pin error.

    The only plausible explanation for this seems to me that the simulator can recognise a poly 2 resistor but not a poly1 resistor.

    Does anyone have any other theories? All ideas welcome!!

    James

    P.S. I keep thinking there is an easy solution to this!


    Originally posted in cdnusers.org by jgrant3
    • Cancel
    • Vote Up 0 Vote Down
    • Cancel

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.

© 2025 Cadence Design Systems, Inc. All Rights Reserved.

  • Terms of Use
  • Privacy
  • Cookie Policy
  • US Trademarks
  • Do Not Sell or Share My Personal Information