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magic vlsi: resistance extraction

Discussion in 'Electronic Design' started by Clunixchit, Jun 17, 2007.

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  1. Clunixchit

    Clunixchit Guest

    Hello there,
    I'm trying to understand how magic extracts resistance to a .sim file.

    I'm using the default of magic and i have created a
    rectangle (2 by 7) with polysilicium.
    A sim file was extracted and the output is as follows:
    | units: 100 tech: scmos format: MIT
    R a_0_n2# 84

    A second sim file was extracted from a similar rectangle but twice the
    width that is (4 by 7) and the output is:
    | units: 100 tech: scmos format: MIT
    C a_0_n2# GND 2.9
    R a_0_n2# 42

    Ok if I follow the simple R = þ*L /A relation
    where þ is the resistivity,
    L : the length in this case 7
    A :the area (H*W),
    so R = (þ/H) L/W
    by this ratio I have þ/H = 24.

    Where and how magic sets þ/H to be 24 when the allows
    2.0/1.6/1.2 µm ?
    Is there a table somewhere which defines the resistance/µm for
    * metal1,metal2,metal3
    * ndiff,pdiff
    * polysilicium
    * ...
    with respect to 2.0/1.6/1.2 µm ?

    google wasn't useful this time.

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