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Not fitting lmax-lmin, wmax-wmin or areamax-areamin range

Nicolas Callens

Hello, 

During transient simulation of my circuit in IC6.1.7 I've encountered some problems in terms of not giving the correct dimensions in the max-min range for my transistors. However, this is strange since my dimensions are in the correct range specified by the input.scs file... Underneath you can find the ERROR (CMI-2440):

 ERROR (CMI-2440): "input.scs" 38: INTEGRATOR-1.pmos-switch-reset:  The length, width, or area of the instance does not fit the given lmax-lmin, wmax-wmin, or areamax-areamin range for any model in the `pch' group. The channel width is 2.000000e-07 and length is 6.500000e-08. Specify channel width and length that do not exceed the referenced maximal area Lmax=2.000001e-05, Lmin=6.000000e-08, Wmax=9.000000e-04 and Wmin=1.200000e-07. You can choose the nearest model by setting the value of `soft_bin' option to `allmodels'.

As you can see, my dimensions are in the specified range...

Thanks!

Kind regards, 

Nicolas

Parents

  • The message reports the extremes, but that doesn't mean there's a bin that fits. For example:

    model nch bsim4 {
    1: type=n \
    lmin=1e-6 lmax=10e-6 wmin=9e-6 wmax=10e-6
    2: type=n \
    lmin=1e-6 lmax=2e-6 wmin=1e-6 wmax=9e-6
    }

    M3 (d g s s) nch w=2e-6 l=3e-6

    This will fail with a similar message - because whilst both w and l are in the range of the wmin-wmax and lmin-lmax, there's no single bin that that w/l combination fits in.

    So maybe it's that?

    Andrew.

Reply

  • The message reports the extremes, but that doesn't mean there's a bin that fits. For example:

    model nch bsim4 {
    1: type=n \
    lmin=1e-6 lmax=10e-6 wmin=9e-6 wmax=10e-6
    2: type=n \
    lmin=1e-6 lmax=2e-6 wmin=1e-6 wmax=9e-6
    }

    M3 (d g s s) nch w=2e-6 l=3e-6

    This will fail with a similar message - because whilst both w and l are in the range of the wmin-wmax and lmin-lmax, there's no single bin that that w/l combination fits in.

    So maybe it's that?

    Andrew.

Children

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