/* ******************************************************************************
   *  BSIM4 4.8.1 released by Chetan Kumar Dabhi 2/15/2017                      *
   *  BSIM4 Model Equations                                                     *
   ******************************************************************************

   ******************************************************************************
   *  Copyright 2017 Regents of the University of California.                   *
   *  All rights reserved.                                                      *
   *                                                                            *
   *  Project Director: Prof. Chenming Hu.                                      *
   *  Authors: Gary W. Ng, Weidong Liu, Xuemei Xi, Mohan Dunga, Wenwei Yang     *
   *           Ali Niknejad, Shivendra Singh Parihar, Chetan Kumar Dabhi        *
   *           Yogesh Singh Chauhan, Sayeef Salahuddin, Chenming Hu             *
   ******************************************************************************

   ******************************************************************************
   *                          CMC In-Code Statement                             *
   *                                                                            *
   *  The Developer agrees that the following statement will appear in the      *
   *  model code that has been adopted as a CMC Standard.                       *
   *                                                                            *
   *  Software is distributed as is, completely without warranty or service     *
   *  support. The University of California and its employees are not liable    *
   *  for the condition or performance of the software.                         *
   *                                                                            *
   *  The University of California owns the copyright and grants users a        *
   *  perpetual, irrevocable, worldwide, non-exclusive, royalty-free license    *
   *  with respect to the software as set forth below.                          *
   *                                                                            *
   *  The University of California hereby disclaims all implied warranties.     *
   *                                                                            *
   *  The University of California grants the users the right to modify,        *
   *  copy, and redistribute the software and documentation, both within        *
   *  the user's organization and externally, subject to the following          *
   *  restrictions:                                                             *
   *                                                                            *
   *  1. The users agree not to charge for the University of California code    *
   *     itself but may charge for additions, extensions, or support.           *
   *                                                                            *
   *  2. In any product based on the software, the users agree to               *
   *     acknowledge the University of California that developed the            *
   *     software. This acknowledgment shall appear in the product              *
   *     documentation.                                                         *
   *                                                                            *
   *  3. Redistributions to others of source code and documentation must        *
   *     retain the copyright notice, disclaimer, and list of conditions.       *
   *                                                                            *
   *  4. Redistributions to others in binary form must reproduce the            *
   *     copyright notice, disclaimer, and list of conditions in the            *
   *     documentation and/or other materials provided with the                 *
   *     distribution.                                                          *
   *                                                                            *
   *  Agreed to on ______Feb. 15, 2017______________                            *
   *                                                                            *
   *  By: ____University of California, Berkeley___                             *
   *      ____Chenming Hu__________________________                             *
   *      ____Professor in Graduate School ________                             *
   *                                                                            *
   ******************************************************************************
   * Modified by Holger Vogt, 12/27/2020
   ******************************************************************************/

#include "ngspice/ngspice.h"
#include "ngspice/cktdefs.h"
#include "bsim4def.h"
#include "ngspice/trandefs.h"
#include "ngspice/const.h"
#include "ngspice/sperror.h"
#include "ngspice/devdefs.h"
#include "ngspice/suffix.h"
#include "ngspice/wordlist.h"
#include "ngspice/cpextern.h"



/* Check for correctness of the BSIM4.8 parameters:
   If parameter excursions are found, put the warning or error message into a wordlist.
   Only then open a file bsim4.out and print the data into the file. */
int
BSIM4checkModel(
BSIM4model *model,
BSIM4instance *here,
CKTcircuit *ckt)
{
    struct bsim4SizeDependParam *pParam;
    int Fatal_Flag = 0;
    FILE *fplog;
    wordlist* wl, *wlstart;

    if (cp_getvar("ng_nomodcheck", CP_BOOL, NULL, 0))
        return(0);

    static char modname[BSIZE_SP];
    size_t mlen = strlen(model->BSIM4modName);

    if (mlen < BSIZE_SP) {
        /* Check the model named model->BSIM4modName only once,
           because BSIM4checkModel() is called for each instance. */
        if (!strncmp(modname, model->BSIM4modName, mlen))
            return(0);
        strcpy(modname, model->BSIM4modName);
    }

    pParam = here->pParam;

    wl = wlstart = TMALLOC(wordlist, 1);
    wl->wl_prev = NULL;
    wl->wl_next = NULL;
    wl->wl_word = tprintf("\nChecking parameters for BSIM 4.8 model %s\n", model->BSIM4modName);

    if ((strcmp(model->BSIM4version, "4.8.1")) && (strncmp(model->BSIM4version, "4.81", 4)) && (strncmp(model->BSIM4version, "4.8", 3)))
    {
        printf("Warning: This model supports BSIM4 version 4.8\n");
        printf("You specified a wrong version number. Working now with BSIM4.8.1\n");
        wl_append_word(&wl, &wl, tprintf("Warning: This model supports BSIM4 version 4.8\n"));
        wl_append_word(&wl, &wl, tprintf("You specified a wrong version number. Working now with BSIM4.8.1.\n"));
    }

    if ((here->BSIM4rgateMod == 2) || (here->BSIM4rgateMod == 3))
    {   if ((here->BSIM4trnqsMod == 1) || (here->BSIM4acnqsMod == 1)) {
            wl_append_word(&wl, &wl, tprintf("Warning: You've selected both Rg and charge deficit NQS; select one only.\n"));
        }
    }

    if (model->BSIM4toxe <= 0.0)
    {
         wl_append_word(&wl, &wl, tprintf("Fatal: Toxe = %g is not positive.\n",
            model->BSIM4toxe));
        Fatal_Flag = 1;
    }

    if (model->BSIM4toxp <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Toxp = %g is not positive.\n", model->BSIM4toxp));
        Fatal_Flag = 1;
    }

    if (model->BSIM4eot <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: EOT = %g is not positive.\n", model->BSIM4eot));
        Fatal_Flag = 1;
    }
    if (model->BSIM4epsrgate < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Epsrgate = %g is not positive.\n", model->BSIM4epsrgate));
        Fatal_Flag = 1;
    }
    if (model->BSIM4epsrsub < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Epsrsub = %g is not positive.\n", model->BSIM4epsrsub));
        Fatal_Flag = 1;
    }
    if (model->BSIM4easub < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Easub = %g is not positive.\n", model->BSIM4easub));
        Fatal_Flag = 1;
    }
    if (model->BSIM4ni0sub <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Easub = %g is not positive.\n", model->BSIM4ni0sub));
        Fatal_Flag = 1;
    }

    if (model->BSIM4toxm <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Toxm = %g is not positive.\n", model->BSIM4toxm));
        Fatal_Flag = 1;
    }
    if (model->BSIM4toxref <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Toxref = %g is not positive.\n", model->BSIM4toxref));
        Fatal_Flag = 1;
    }

    if (pParam->BSIM4lpe0 < -pParam->BSIM4leff)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Lpe0 = %g is less than -Leff.\n",
            pParam->BSIM4lpe0));
        Fatal_Flag = 1;
    }
    if (model->BSIM4lintnoi > pParam->BSIM4leff / 2)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Lintnoi = %g is too large - Leff for noise is negative.\n",
            model->BSIM4lintnoi));
        Fatal_Flag = 1;
    }
    if (pParam->BSIM4lpeb < -pParam->BSIM4leff)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Lpeb = %g is less than -Leff.\n",
            pParam->BSIM4lpeb));
        Fatal_Flag = 1;
    }
    if (pParam->BSIM4ndep <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Ndep = %g is not positive.\n",
            pParam->BSIM4ndep));
        Fatal_Flag = 1;
    }
    if (pParam->BSIM4phi <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Phi = %g is not positive. Please check Phin and Ndep\n",
            pParam->BSIM4phi));
        wl_append_word(&wl, &wl, tprintf("	   Phin = %g  Ndep = %g \n",
            pParam->BSIM4phin, pParam->BSIM4ndep));
        Fatal_Flag = 1;
    }
    if (pParam->BSIM4nsub <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Nsub = %g is not positive.\n",
            pParam->BSIM4nsub));
        Fatal_Flag = 1;
    }
    if (pParam->BSIM4ngate < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Ngate = %g Ngate is not positive.\n",
            pParam->BSIM4ngate));
        Fatal_Flag = 1;
    }
    if (pParam->BSIM4ngate > 1.e25)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Ngate = %g Ngate is too high\n",
            pParam->BSIM4ngate));
        Fatal_Flag = 1;
    }
    if (pParam->BSIM4xj <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Xj = %g is not positive.\n", pParam->BSIM4xj));
        Fatal_Flag = 1;
    }

    if (pParam->BSIM4dvt1 < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Dvt1 = %g is negative.\n", pParam->BSIM4dvt1));
        Fatal_Flag = 1;
    }

    if (pParam->BSIM4dvt1w < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Dvt1w = %g is negative.\n", pParam->BSIM4dvt1w));
        Fatal_Flag = 1;
    }

    if (pParam->BSIM4w0 == -pParam->BSIM4weff)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: (W0 + Weff) = 0 causing divided-by-zero.\n"));
        Fatal_Flag = 1;
    }

    if (pParam->BSIM4dsub < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Dsub = %g is negative.\n", pParam->BSIM4dsub));
        Fatal_Flag = 1;
    }
    if (pParam->BSIM4b1 == -pParam->BSIM4weff)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: (B1 + Weff) = 0 causing divided-by-zero.\n"));
        Fatal_Flag = 1;
    }
    if (here->BSIM4u0temp <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: u0 at current temperature = %g is not positive.\n",
            here->BSIM4u0temp));
        Fatal_Flag = 1;
    }

    if (pParam->BSIM4delta < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Delta = %g is less than zero.\n", pParam->BSIM4delta));
        Fatal_Flag = 1;
    }

    if (here->BSIM4vsattemp <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Vsat at current temperature = %g is not positive.\n",
            here->BSIM4vsattemp));
        Fatal_Flag = 1;
    }

    if (pParam->BSIM4pclm <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Pclm = %g is not positive.\n", pParam->BSIM4pclm));
        Fatal_Flag = 1;
    }

    if (pParam->BSIM4drout < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Drout = %g is negative.\n", pParam->BSIM4drout));
        Fatal_Flag = 1;
    }

    if (here->BSIM4m <= 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: multiplier = %g is not positive.\n", here->BSIM4m));
        Fatal_Flag = 1;
    }
    if (here->BSIM4nf < 1.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Number of finger = %g is smaller than one.\n", here->BSIM4nf));
        Fatal_Flag = 1;
    }

    if ((here->BSIM4sa > 0.0) && (here->BSIM4sb > 0.0) &&
        ((here->BSIM4nf == 1.0) || ((here->BSIM4nf > 1.0) && (here->BSIM4sd > 0.0))))
    {
        if (model->BSIM4saref <= 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Fatal: SAref = %g is not positive.\n", model->BSIM4saref));
            Fatal_Flag = 1;
        }
        if (model->BSIM4sbref <= 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Fatal: SBref = %g is not positive.\n", model->BSIM4sbref));
            Fatal_Flag = 1;
        }
    }

    if ((here->BSIM4l + model->BSIM4xl) <= model->BSIM4xgl)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: The parameter xgl must be smaller than Ldrawn+XL.\n"));
        Fatal_Flag = 1;
    }
    if (here->BSIM4ngcon < 1.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: The parameter ngcon cannot be smaller than one.\n"));
        Fatal_Flag = 1;
    }
    if ((here->BSIM4ngcon != 1.0) && (here->BSIM4ngcon != 2.0))
    {
        here->BSIM4ngcon = 1.0;
        wl_append_word(&wl, &wl, tprintf("Warning: Ngcon must be equal to one or two; reset to 1.0.\n"));
    }

    if (model->BSIM4gbmin < 1.0e-20)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: Gbmin = %g is too small.\n", model->BSIM4gbmin));
    }

    /* Check saturation parameters */
    if (pParam->BSIM4fprout < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: fprout = %g is negative.\n", pParam->BSIM4fprout));
        Fatal_Flag = 1;
    }
    if (pParam->BSIM4pdits < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: pdits = %g is negative.\n", pParam->BSIM4pdits));
        Fatal_Flag = 1;
    }
    if (model->BSIM4pditsl < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: pditsl = %g is negative.\n", model->BSIM4pditsl));
        Fatal_Flag = 1;
    }

    /* Check gate current parameters */
    if (model->BSIM4igbMod) {
        if (pParam->BSIM4nigbinv <= 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Fatal: nigbinv = %g is non-positive.\n", pParam->BSIM4nigbinv));
            Fatal_Flag = 1;
        }
        if (pParam->BSIM4nigbacc <= 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Fatal: nigbacc = %g is non-positive.\n", pParam->BSIM4nigbacc));
            Fatal_Flag = 1;
        }
    }
    if (model->BSIM4igcMod) {
        if (pParam->BSIM4nigc <= 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Fatal: nigc = %g is non-positive.\n", pParam->BSIM4nigc));
            Fatal_Flag = 1;
        }
        if (pParam->BSIM4poxedge <= 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Fatal: poxedge = %g is non-positive.\n", pParam->BSIM4poxedge));
            Fatal_Flag = 1;
        }
        if (pParam->BSIM4pigcd <= 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Fatal: pigcd = %g is non-positive.\n", pParam->BSIM4pigcd));
            Fatal_Flag = 1;
        }
    }

    /* Check capacitance parameters */
    if (pParam->BSIM4clc < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Clc = %g is negative.\n", pParam->BSIM4clc));
        Fatal_Flag = 1;
    }

    /* Check overlap capacitance parameters */
    if (pParam->BSIM4ckappas < 0.02)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: ckappas = %g is too small.\n", pParam->BSIM4ckappas));
        pParam->BSIM4ckappas = 0.02;
    }
    if (pParam->BSIM4ckappad < 0.02)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: ckappad = %g is too small.\n", pParam->BSIM4ckappad));
        pParam->BSIM4ckappad = 0.02;
    }

    if (model->BSIM4vtss < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Vtss = %g is negative.\n",
            model->BSIM4vtss));
        Fatal_Flag = 1;
    }
    if (model->BSIM4vtsd < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Vtsd = %g is negative.\n",
            model->BSIM4vtsd));
        Fatal_Flag = 1;
    }
    if (model->BSIM4vtssws < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Vtssws = %g is negative.\n",
            model->BSIM4vtssws));
        Fatal_Flag = 1;
    }
    if (model->BSIM4vtsswd < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Vtsswd = %g is negative.\n",
            model->BSIM4vtsswd));
        Fatal_Flag = 1;
    }
    if (model->BSIM4vtsswgs < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Vtsswgs = %g is negative.\n",
            model->BSIM4vtsswgs));
        Fatal_Flag = 1;
    }
    if (model->BSIM4vtsswgd < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Fatal: Vtsswgd = %g is negative.\n",
            model->BSIM4vtsswgd));
        Fatal_Flag = 1;
    }


    if (model->BSIM4paramChk == 1)
    {
        /* Check L and W parameters */
        if (pParam->BSIM4leff <= 1.0e-9)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Leff = %g <= 1.0e-9. Recommended Leff >= 1e-8 \n",
                pParam->BSIM4leff));
        }

        if (pParam->BSIM4leffCV <= 1.0e-9)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Leff for CV = %g <= 1.0e-9. Recommended LeffCV >=1e-8 \n",
                pParam->BSIM4leffCV));
        }

        if (pParam->BSIM4weff <= 1.0e-9)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Weff = %g <= 1.0e-9. Recommended Weff >=1e-7 \n",
                pParam->BSIM4weff));
        }

        if (pParam->BSIM4weffCV <= 1.0e-9)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Weff for CV = %g <= 1.0e-9. Recommended WeffCV >= 1e-7 \n",
                pParam->BSIM4weffCV));
        }

        /* Check threshold voltage parameters */
        if (model->BSIM4toxe < 1.0e-10)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Toxe = %g is less than 1A. Recommended Toxe >= 5A\n", model->BSIM4toxe));
        }
        if (model->BSIM4toxp < 1.0e-10)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Toxp = %g is less than 1A. Recommended Toxp >= 5A\n", model->BSIM4toxp));
        }
        if (model->BSIM4toxm < 1.0e-10)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Toxm = %g is less than 1A. Recommended Toxm >= 5A\n", model->BSIM4toxm));
        }

        if (pParam->BSIM4ndep <= 1.0e12)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Ndep = %g may be too small.\n",
                pParam->BSIM4ndep));
        }
        else if (pParam->BSIM4ndep >= 1.0e21)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Ndep = %g may be too large.\n",
                pParam->BSIM4ndep));
        }

        if (pParam->BSIM4nsub <= 1.0e14)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Nsub = %g may be too small.\n",
                pParam->BSIM4nsub));
        }
        else if (pParam->BSIM4nsub >= 1.0e21)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Nsub = %g may be too large.\n",
                pParam->BSIM4nsub));
        }

        if ((pParam->BSIM4ngate > 0.0) &&
            (pParam->BSIM4ngate <= 1.e18))
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Ngate = %g is less than 1.E18cm^-3.\n",
                pParam->BSIM4ngate));
        }

        if (pParam->BSIM4dvt0 < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Dvt0 = %g is negative.\n", pParam->BSIM4dvt0));
        }

        if (fabs(1.0e-8 / (pParam->BSIM4w0 + pParam->BSIM4weff)) > 10.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: (W0 + Weff) may be too small.\n"));
        }

        /* Check subthreshold parameters */
        if (pParam->BSIM4nfactor < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Nfactor = %g is negative.\n", pParam->BSIM4nfactor));
        }
        if (pParam->BSIM4cdsc < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Cdsc = %g is negative.\n", pParam->BSIM4cdsc));
        }
        if (pParam->BSIM4cdscd < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Cdscd = %g is negative.\n", pParam->BSIM4cdscd));
        }
        /* Check DIBL parameters */
        if (here->BSIM4eta0 < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Eta0 = %g is negative.\n", here->BSIM4eta0));
        }

        /* Check Abulk parameters */
        if (fabs(1.0e-8 / (pParam->BSIM4b1 + pParam->BSIM4weff)) > 10.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: (B1 + Weff) may be too small.\n"));
        }


        /* Check Saturation parameters */
        if (pParam->BSIM4a2 < 0.01)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: A2 = %g is too small. Set to 0.01.\n",
                pParam->BSIM4a2));
            pParam->BSIM4a2 = 0.01;
        }
        else if (pParam->BSIM4a2 > 1.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: A2 = %g is larger than 1. A2 is set to 1 and A1 is set to 0.\n",
                pParam->BSIM4a2));
            pParam->BSIM4a2 = 1.0;
            pParam->BSIM4a1 = 0.0;
        }

        if (pParam->BSIM4prwg < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Prwg = %g is negative. Set to zero.\n",
                pParam->BSIM4prwg));
            pParam->BSIM4prwg = 0.0;
        }

        if (pParam->BSIM4rdsw < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Rdsw = %g is negative. Set to zero.\n",
                pParam->BSIM4rdsw));
            pParam->BSIM4rdsw = 0.0;
            pParam->BSIM4rds0 = 0.0;
        }

        if (pParam->BSIM4rds0 < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Rds at current temperature = %g is negative. Set to zero.\n",
                pParam->BSIM4rds0));
            pParam->BSIM4rds0 = 0.0;
        }

        if (pParam->BSIM4rdswmin < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Rdswmin at current temperature = %g is negative. Set to zero.\n",
                pParam->BSIM4rdswmin));
            pParam->BSIM4rdswmin = 0.0;
        }

        if (pParam->BSIM4pscbe2 <= 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Pscbe2 = %g is not positive.\n", pParam->BSIM4pscbe2));
        }

        if (pParam->BSIM4vsattemp < 1.0e3)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Vsat at current temperature = %g may be too small.\n", pParam->BSIM4vsattemp));
        }

        if ((model->BSIM4lambdaGiven) && (pParam->BSIM4lambda > 0.0))
        {
            if (pParam->BSIM4lambda > 1.0e-9)
            {
                wl_append_word(&wl, &wl, tprintf("Warning: Lambda = %g may be too large.\n", pParam->BSIM4lambda));
            }
        }

        if ((model->BSIM4vtlGiven) && (pParam->BSIM4vtl > 0.0))
        {
            if (pParam->BSIM4vtl < 6.0e4)
            {
                wl_append_word(&wl, &wl, tprintf("Warning: Thermal velocity vtl = %g may be too small.\n", pParam->BSIM4vtl));
            }

            if (pParam->BSIM4xn < 3.0)
            {
                wl_append_word(&wl, &wl, tprintf("Warning: back scattering coeff xn = %g is too small. Reset to 3.0 \n", pParam->BSIM4xn));
                pParam->BSIM4xn = 3.0;
            }

            if (model->BSIM4lc < 0.0)
            {
                wl_append_word(&wl, &wl, tprintf("Warning: back scattering coeff lc = %g is too small. Reset to 0.0\n", model->BSIM4lc));
                pParam->BSIM4lc = 0.0;
            }
        }

        if (pParam->BSIM4pdibl1 < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Pdibl1 = %g is negative.\n", pParam->BSIM4pdibl1));
        }
    }

    if (pParam->BSIM4pdibl2 < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: Pdibl2 = %g is negative.\n", pParam->BSIM4pdibl2));
    }

    /* Check stress effect parameters */
    if ((here->BSIM4sa > 0.0) && (here->BSIM4sb > 0.0) &&
        ((here->BSIM4nf == 1.0) || ((here->BSIM4nf > 1.0) && (here->BSIM4sd > 0.0))))
    {
        if (model->BSIM4lodk2 <= 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: LODK2 = %g is not positive.\n", model->BSIM4lodk2));
        }
        if (model->BSIM4lodeta0 <= 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: LODETA0 = %g is not positive.\n", model->BSIM4lodeta0));
        }
    }

/* Check gate resistance parameters */
    if (here->BSIM4rgateMod == 1)
    {   if (model->BSIM4rshg <= 0.0)
            wl_append_word(&wl, &wl, tprintf("Warning: rshg should be positive for rgateMod = 1.\n"));
    }
    else if (here->BSIM4rgateMod == 2)
    {   if (model->BSIM4rshg <= 0.0)
            wl_append_word(&wl, &wl, tprintf("Warning: rshg <= 0.0 for rgateMod = 2.\n"));
        else if (pParam->BSIM4xrcrg1 <= 0.0)
                 wl_append_word(&wl, &wl, tprintf("Warning: xrcrg1 <= 0.0 for rgateMod = 2.\n"));
    }
    if (here->BSIM4rgateMod == 3)
    {   if (model->BSIM4rshg <= 0.0)
            wl_append_word(&wl, &wl, tprintf("Warning: rshg should be positive for rgateMod = 3.\n"));
        else if (pParam->BSIM4xrcrg1 <= 0.0)
            wl_append_word(&wl, &wl, tprintf("Warning: xrcrg1 should be positive for rgateMod = 3.\n"));
    }

     /* Check body resistance parameters */
    if (model->BSIM4rbps0 <= 0.0)
    {   wl_append_word(&wl, &wl, tprintf("Fatal: RBPS0 = %g is not positive.\n", model->BSIM4rbps0));
        Fatal_Flag = 1;
    }
    if (model->BSIM4rbpd0 <= 0.0)
    {   wl_append_word(&wl, &wl, tprintf("Fatal: RBPD0 = %g is not positive.\n", model->BSIM4rbpd0));
        Fatal_Flag = 1;
    }
    if (model->BSIM4rbpbx0 <= 0.0)
    {   wl_append_word(&wl, &wl, tprintf("Fatal: RBPBX0 = %g is not positive.\n", model->BSIM4rbpbx0));
        Fatal_Flag = 1;
    }
    if (model->BSIM4rbpby0 <= 0.0)
    {   wl_append_word(&wl, &wl, tprintf("Fatal: RBPBY0 = %g is not positive.\n", model->BSIM4rbpby0));
        Fatal_Flag = 1;
    }
    if (model->BSIM4rbdbx0 <= 0.0)
    {   wl_append_word(&wl, &wl, tprintf("Fatal: RBDBX0 = %g is not positive.\n", model->BSIM4rbdbx0));
        Fatal_Flag = 1;
    }
    if (model->BSIM4rbdby0 <= 0.0)
    {   wl_append_word(&wl, &wl, tprintf("Fatal: RBDBY0 = %g is not positive.\n", model->BSIM4rbdby0));
        Fatal_Flag = 1;
    }
    if (model->BSIM4rbsbx0 <= 0.0)
    {   wl_append_word(&wl, &wl, tprintf("Fatal: RBSBX0 = %g is not positive.\n", model->BSIM4rbsbx0));
        Fatal_Flag = 1;
    }
    if (model->BSIM4rbsby0 <= 0.0)
    {   wl_append_word(&wl, &wl, tprintf("Fatal: RBSBY0 = %g is not positive.\n", model->BSIM4rbsby0));
        Fatal_Flag = 1;
    }

    /* Check capacitance parameters */
    if (pParam->BSIM4noff < 0.1)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: Noff = %g is too small.\n", pParam->BSIM4noff));
    }

    if (pParam->BSIM4voffcv < -0.5)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: Voffcv = %g is too small.\n", pParam->BSIM4voffcv));
    }

    if (pParam->BSIM4moin < 5.0)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: Moin = %g is too small.\n", pParam->BSIM4moin));
    }
    if (pParam->BSIM4moin > 25.0)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: Moin = %g is too large.\n", pParam->BSIM4moin));
    }
    if (model->BSIM4capMod == 2) {
        if (pParam->BSIM4acde < 0.1)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Acde = %g is too small.\n", pParam->BSIM4acde));
        }
        if (pParam->BSIM4acde > 1.6)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: Acde = %g is too large.\n", pParam->BSIM4acde));
        }
    }

    /* Check overlap capacitance parameters */
    if (model->BSIM4cgdo < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: cgdo = %g is negative. Set to zero.\n", model->BSIM4cgdo));
        model->BSIM4cgdo = 0.0;
    }
    if (model->BSIM4cgso < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: cgso = %g is negative. Set to zero.\n", model->BSIM4cgso));
        model->BSIM4cgso = 0.0;
    }
    if (model->BSIM4cgbo < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: cgbo = %g is negative. Set to zero.\n", model->BSIM4cgbo));
        model->BSIM4cgbo = 0.0;
    }
    if (model->BSIM4tnoiMod == 1){
        wl_append_word(&wl, &wl, tprintf("Warning: TNOIMOD=1 is not supported and may be removed from future version.\n"));
    }

    if ((strcmp(model->BSIM4version, "4.8.1")) && (strncmp(model->BSIM4version, "4.81", 4))) {
        /* v4.7 */
        if (model->BSIM4tnoiMod == 1 || model->BSIM4tnoiMod == 2) {
            if (model->BSIM4tnoia < 0.0)
            {
                wl_append_word(&wl, &wl, tprintf("Warning: tnoia = %g is negative. Set to zero.\n", model->BSIM4tnoia));
                model->BSIM4tnoia = 0.0;
            }
            if (model->BSIM4tnoib < 0.0)
            {
                wl_append_word(&wl, &wl, tprintf("Warning: tnoib = %g is negative. Set to zero.\n", model->BSIM4tnoib));
                model->BSIM4tnoib = 0.0;
            }

            if (model->BSIM4rnoia < 0.0)
            {
                wl_append_word(&wl, &wl, tprintf("Warning: rnoia = %g is negative. Set to zero.\n", model->BSIM4rnoia));
                model->BSIM4rnoia = 0.0;
            }
            if (model->BSIM4rnoib < 0.0)
            {
                wl_append_word(&wl, &wl, tprintf("Warning: rnoib = %g is negative. Set to zero.\n", model->BSIM4rnoib));
                model->BSIM4rnoib = 0.0;
            }
        }

        /* v4.7 */
        if (model->BSIM4tnoiMod == 2) {
            if (model->BSIM4tnoic < 0.0) {
                wl_append_word(&wl, &wl, tprintf("Warning: tnoic = %g is negative. Set to zero.\n", model->BSIM4tnoic));
                model->BSIM4tnoic = 0.0;
            }
            if (model->BSIM4rnoic < 0.0) {
                wl_append_word(&wl, &wl, tprintf("Warning: rnoic = %g is negative. Set to zero.\n", model->BSIM4rnoic));
                model->BSIM4rnoic = 0.0;
            }
        }
    }
    else
    {
        if (model->BSIM4tnoiMod == 1){
            if (model->BSIM4tnoia < 0.0) {
                wl_append_word(&wl, &wl, tprintf("Warning: tnoia = %g is negative. Set to zero.\n", model->BSIM4tnoia));
                model->BSIM4tnoia = 0.0;
            }
            if (model->BSIM4tnoib < 0.0) {
                wl_append_word(&wl, &wl, tprintf("Warning: tnoib = %g is negative. Set to zero.\n", model->BSIM4tnoib));
                model->BSIM4tnoib = 0.0;
            }
            if (model->BSIM4rnoia < 0.0) {
                wl_append_word(&wl, &wl, tprintf("Warning: rnoia = %g is negative. Set to zero.\n", model->BSIM4rnoia));
                model->BSIM4rnoia = 0.0;
            }
            if (model->BSIM4rnoib < 0.0) {
                wl_append_word(&wl, &wl, tprintf("Warning: rnoib = %g is negative. Set to zero.\n", model->BSIM4rnoib));
                model->BSIM4rnoib = 0.0;
            }
        }
    }

    /* Limits of Njs and Njd modified in BSIM4.7 */
    if (model->BSIM4SjctEmissionCoeff < 0.1) {
        wl_append_word(&wl, &wl, tprintf("Warning: Njs = %g is less than 0.1. Setting Njs to 0.1.\n", model->BSIM4SjctEmissionCoeff));
            model->BSIM4SjctEmissionCoeff = 0.1;
    }
    else if (model->BSIM4SjctEmissionCoeff < 0.7) {
        wl_append_word(&wl, &wl, tprintf("Warning: Njs = %g is less than 0.7.\n", model->BSIM4SjctEmissionCoeff));
    }
    if (model->BSIM4DjctEmissionCoeff < 0.1)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: Njd = %g is less than 0.1. Setting Njd to 0.1.\n", model->BSIM4DjctEmissionCoeff));
        model->BSIM4DjctEmissionCoeff = 0.1;
    }
    else if (model->BSIM4DjctEmissionCoeff < 0.7) {
        wl_append_word(&wl, &wl, tprintf("Warning: Njd = %g is less than 0.7.\n", model->BSIM4DjctEmissionCoeff));
    }

    if (model->BSIM4njtsstemp < 0.0) {
        wl_append_word(&wl, &wl, tprintf("Warning: Njts = %g is negative at temperature = %g.\n",
               model->BSIM4njtsstemp, ckt->CKTtemp));
    }
    if (model->BSIM4njtsswstemp < 0.0) {
        wl_append_word(&wl, &wl, tprintf("Warning: Njtssw = %g is negative at temperature = %g.\n",
                model->BSIM4njtsswstemp, ckt->CKTtemp));
    }
    if (model->BSIM4njtsswgstemp < 0.0) {
        wl_append_word(&wl, &wl, tprintf("Warning: Njtsswg = %g is negative at temperature = %g.\n",
                model->BSIM4njtsswgstemp, ckt->CKTtemp));
    }

    if (model->BSIM4njtsdGiven && model->BSIM4njtsdtemp < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: Njtsd = %g is negative at temperature = %g.\n",
            model->BSIM4njtsdtemp, ckt->CKTtemp));
    }
    if (model->BSIM4njtsswdGiven && model->BSIM4njtsswdtemp < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: Njtsswd = %g is negative at temperature = %g.\n",
            model->BSIM4njtsswdtemp, ckt->CKTtemp));
    }
    if (model->BSIM4njtsswgdGiven && model->BSIM4njtsswgdtemp < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: Njtsswgd = %g is negative at temperature = %g.\n",
            model->BSIM4njtsswgdtemp, ckt->CKTtemp));
    }

    if (model->BSIM4ntnoi < 0.0)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: ntnoi = %g is negative. Set to zero.\n", model->BSIM4ntnoi));
        model->BSIM4ntnoi = 0.0;
    }

    /* diode model */
    if (model->BSIM4SbulkJctBotGradingCoeff >= 0.99)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: MJS = %g is too big. Set to 0.99.\n", model->BSIM4SbulkJctBotGradingCoeff));
        model->BSIM4SbulkJctBotGradingCoeff = 0.99;
    }
    if (model->BSIM4SbulkJctSideGradingCoeff >= 0.99)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: MJSWS = %g is too big. Set to 0.99.\n", model->BSIM4SbulkJctSideGradingCoeff));
        model->BSIM4SbulkJctSideGradingCoeff = 0.99;
    }
    if (model->BSIM4SbulkJctGateSideGradingCoeff >= 0.99)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: MJSWGS = %g is too big. Set to 0.99.\n", model->BSIM4SbulkJctGateSideGradingCoeff));
        model->BSIM4SbulkJctGateSideGradingCoeff = 0.99;
    }

    if (model->BSIM4DbulkJctBotGradingCoeff >= 0.99)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: MJD = %g is too big. Set to 0.99.\n", model->BSIM4DbulkJctBotGradingCoeff));
        model->BSIM4DbulkJctBotGradingCoeff = 0.99;
    }
    if (model->BSIM4DbulkJctSideGradingCoeff >= 0.99)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: MJSWD = %g is too big. Set to 0.99.\n", model->BSIM4DbulkJctSideGradingCoeff));
        model->BSIM4DbulkJctSideGradingCoeff = 0.99;
    }
    if (model->BSIM4DbulkJctGateSideGradingCoeff >= 0.99)
    {
        wl_append_word(&wl, &wl, tprintf("Warning: MJSWGD = %g is too big. Set to 0.99.\n", model->BSIM4DbulkJctGateSideGradingCoeff));
        model->BSIM4DbulkJctGateSideGradingCoeff = 0.99;
    }
    if (model->BSIM4wpemod == 1)
    {
        if (model->BSIM4scref <= 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: SCREF = %g is not positive. Set to 1e-6.\n", model->BSIM4scref));
            model->BSIM4scref = 1e-6;
        }
        if (here->BSIM4sca < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: SCA = %g is negative. Set to 0.0.\n", here->BSIM4sca));
            here->BSIM4sca = 0.0;
        }
        if (here->BSIM4scb < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: SCB = %g is negative. Set to 0.0.\n", here->BSIM4scb));
            here->BSIM4scb = 0.0;
        }
        if (here->BSIM4scc < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: SCC = %g is negative. Set to 0.0.\n", here->BSIM4scc));
            here->BSIM4scc = 0.0;
        }
        if (here->BSIM4sc < 0.0)
        {
            wl_append_word(&wl, &wl, tprintf("Warning: SC = %g is negative. Set to 0.0.\n", here->BSIM4sc));
            here->BSIM4sc = 0.0;
        }
    }

    if (wlstart->wl_next) {
        if ((fplog = fopen("bsim4.out", "w")) != NULL) {
            while (wlstart) {
                fprintf(fplog, "%s", wlstart->wl_word);
                fprintf(stderr, "%s", wlstart->wl_word);
                wlstart = wlstart->wl_next;
            }
            fclose(fplog);
        }
        else {
            while (wlstart) {
                fprintf(stderr, "%s", wlstart->wl_word);
                wlstart = wlstart->wl_next;
            }
        }
    }

    wl_free(wlstart);

    return(Fatal_Flag);
}

