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13.5 BSIM2: Berkeley Short Channel IGFET Model

     
      ------------------------------------------------------------
     |          BSIM2 - instance parameters (input-only)         |
     |-----------------------------------------------------------+
     | ic                Vector of DS,GS,BS initial voltages     |
      ------------------------------------------------------------
     
     
      ------------------------------------------------------------
     |         BSIM2 - instance parameters (input-output)        |
     |-----------------------------------------------------------+
     | l                 Length                                  |
     | w                 Width                                   |
     | ad                Drain area                              |
     | as                Source area                             |
      ------------------------------------------------------------
     | pd                Drain perimeter                         |
     | ps                Source perimeter                        |
     | nrd               Number of squares in drain              |
     | nrs               Number of squares in source             |
     |-----------------------------------------------------------+
     | off               Device is initially off                 |
     | vds               Initial D-S voltage                     |
     | vgs               Initial G-S voltage                     |
     | vbs               Initial B-S voltage                     |
      ------------------------------------------------------------
     
     
      ------------------------------------------------------------
     |           BSIM2 - model parameters (input-only)           |
     |-----------------------------------------------------------+
     | nmos              Flag to indicate NMOS                   |
     | pmos              Flag to indicate PMOS                   |
      ------------------------------------------------------------
     
     
      ------------------------------------------------------------
     |          BSIM2 - model parameters (input-output)          |
     |-----------------------------------------------------------+
     |vfb             Flat band voltage                          |
     |lvfb            Length dependence of vfb                   |
     |wvfb            Width dependence of vfb                    |
     |phi             Strong inversion surface potential         |
      ------------------------------------------------------------
     |lphi            Length dependence of phi                   |
     |wphi            Width dependence of phi                    |
     |k1              Bulk effect coefficient 1                  |
     |lk1             Length dependence of k1                    |
     |-----------------------------------------------------------+
     |wk1             Width dependence of k1                     |
     |k2              Bulk effect coefficient 2                  |
     |lk2             Length dependence of k2                    |
     |wk2             Width dependence of k2                     |
      ------------------------------------------------------------
     |eta0            VDS dependence of threshold voltage at VDD=0
     |leta0           Length dependence of eta0                  |
     |weta0           Width dependence of eta0                   |
     |etab            VBS dependence of eta                      |
     |-----------------------------------------------------------+
     |letab           Length dependence of etab                  |
     |wetab           Width dependence of etab                   |
     |dl              Channel length reduction in um             |
     |dw              Channel width reduction in um              |
      ------------------------------------------------------------
     |mu0             Low-field mobility, at VDS=0 VGS=VTH       |
     |mu0b            VBS dependence of low-field mobility       |
     |lmu0b           Length dependence of mu0b                  |
     |wmu0b           Width dependence of mu0b                   |
     |-----------------------------------------------------------+
     |mus0            Mobility at VDS=VDD VGS=VTH                |
     |lmus0           Length dependence of mus0                  |
     |wmus0           Width dependence of mus                    |
     |musb            VBS dependence of mus                      |
      ------------------------------------------------------------
     |lmusb           Length dependence of musb                  |
     |wmusb           Width dependence of musb                   |
     |mu20            VDS dependence of mu in tanh term          |
     |lmu20           Length dependence of mu20                  |
     |-----------------------------------------------------------+
     |wmu20           Width dependence of mu20                   |
     |mu2b            VBS dependence of mu2                      |
     |lmu2b           Length dependence of mu2b                  |
     |wmu2b           Width dependence of mu2b                   |
      ------------------------------------------------------------
     |mu2g            VGS dependence of mu2                      |
     |                         continued                |
      ------------------------------------------------------------
     
     
      ------------------------------------------------------------
     |     BSIM2 - model input-output parameters - continued
     |-----------------------------------------------------------+
     | lmu2g             Length dependence of mu2g               |
     | wmu2g             Width dependence of mu2g                |
     | mu30              VDS dependence of mu in linear term     |
     | lmu30             Length dependence of mu30               |
      ------------------------------------------------------------
     | wmu30             Width dependence of mu30                |
     | mu3b              VBS dependence of mu3                   |
     | lmu3b             Length dependence of mu3b               |
     | wmu3b             Width dependence of mu3b                |
     |-----------------------------------------------------------+
     | mu3g              VGS dependence of mu3                   |
     | lmu3g             Length dependence of mu3g               |
     | wmu3g             Width dependence of mu3g                |
     | mu40              VDS dependence of mu in linear term     |
      ------------------------------------------------------------
     | lmu40             Length dependence of mu40               |
     | wmu40             Width dependence of mu40                |
     | mu4b              VBS dependence of mu4                   |
     | lmu4b             Length dependence of mu4b               |
     |-----------------------------------------------------------+
     | wmu4b             Width dependence of mu4b                |
     | mu4g              VGS dependence of mu4                   |
     | lmu4g             Length dependence of mu4g               |
     | wmu4g             Width dependence of mu4g                |
      ------------------------------------------------------------
     | ua0               Linear VGS dependence of mobility       |
     | lua0              Length dependence of ua0                |
     | wua0              Width dependence of ua0                 |
     | uab               VBS dependence of ua                    |
     |-----------------------------------------------------------+
     | luab              Length dependence of uab                |
     | wuab              Width dependence of uab                 |
     | ub0               Quadratic VGS dependence of mobility    |
     | lub0              Length dependence of ub0                |
      ------------------------------------------------------------
     | wub0              Width dependence of ub0                 |
     | ubb               VBS dependence of ub                    |
     | lubb              Length dependence of ubb                |
     | wubb              Width dependence of ubb                 |
     |-----------------------------------------------------------+
     | u10               VDS dependence of mobility              |
     | lu10              Length dependence of u10                |
       wu10              Width dependence of u100                |
     | u1b               VBS dependence of u1                    |
      ------------------------------------------------------------
     | lu1b              Length dependence of u1b                |
     | wu1b              Width dependence of u1b                 |
     | u1d               VDS dependence of u1                    |
     | lu1d              Length dependence of u1d                |
     |-----------------------------------------------------------+
     | wu1d              Width dependence of u1d                 |
     | n0                Subthreshold slope at VDS=0 VBS=0       |
     | ln0               Length dependence of n0                 |
     |                         continued                         |
      ------------------------------------------------------------
     
     
      --------------------------------------------------------------
     |           BSIM2 - model input-output parameters - continued  |
     |--------------------------------------------------------------+
     |wn0            Width dependence of n0                         |
     |nb             VBS dependence of n                            |
     |lnb            Length dependence of nb                        |
     |wnb            Width dependence of nb                         |
      --------------------------------------------------------------+
     |nd             VDS dependence of n                            |
     |lnd            Length dependence of nd                        |
     |wnd            Width dependence of nd                         |
     |vof0           Threshold voltage offset AT VDS=0 VBS=0        |
     |--------------------------------------------------------------+
     |lvof0          Length dependence of vof0                      |
     |wvof0          Width dependence of vof0                       |
     |vofb           VBS dependence of vof                          |
     |lvofb          Length dependence of vofb                      |
      --------------------------------------------------------------+
     |wvofb          Width dependence of vofb                       |
     |vofd           VDS dependence of vof                          |
     |lvofd          Length dependence of vofd                      |
     |wvofd          Width dependence of vofd                       |
     |--------------------------------------------------------------+
     |ai0            Pre-factor of hot-electron effect.             |
     |lai0           Length dependence of ai0                       |
     |wai0           Width dependence of ai0                        |
     |aib            VBS dependence of ai                           |
      --------------------------------------------------------------+
     |laib           Length dependence of aib                       |
     |waib           Width dependence of aib                        |
     |bi0            Exponential factor of hot-electron effect.     |
     |lbi0           Length dependence of bi0                       |
     |--------------------------------------------------------------+
     |wbi0           Width dependence of bi0                        |
     |bib            VBS dependence of bi                           |
     |lbib           Length dependence of bib                       |
     |wbib           Width dependence of bib                        |
      --------------------------------------------------------------+
     |vghigh         Upper bound of the cubic spline function.      |
     |lvghigh        Length dependence of vghigh                    |
     |wvghigh        Width dependence of vghigh                     |
     |vglow          Lower bound of the cubic spline function.      |
     |--------------------------------------------------------------+
     |lvglow         Length dependence of vglow                     |
     |wvglow         Width dependence of vglow                      |
     |tox            Gate oxide thickness in um                     |
     |temp           Temperature in degree Celcius                  |
      --------------------------------------------------------------+
     |vdd            Maximum Vds                                    |
     |vgg            Maximum Vgs                                    |
     |vbb            Maximum Vbs                                    |
     |cgso           Gate source overlap capacitance per unit       |
     |               channel width(m)                               |
     |--------------------------------------------------------------+
     |cgdo           Gate drain overlap capacitance                 |
     |               per unit channel width(m)                      |
     |cgbo           Gate bulk overlap capacitance                  |
     |               per unit channel length(m)                     |
     |xpart          Flag for channel charge partitioning           |
     |                               continued                      |
      ---------------------------------------------------------------
     
     
      ---------------------------------------------------------------
     |             BSIM2 - model input-output parameters            |
     |--------------------------------------------------------------+
     |rsh            Source drain diffusion sheet resistance        |
     |               in ohm per square                              |
     |js             Source drain junction saturation current       |
     |               per unit area                                  |
     |pb             Source drain junction built in potential       |
     |mj             Source drain bottom junction capacitance       |
     |               grading coefficient                            |
      --------------------------------------------------------------+
     |pbsw           Source drain side junction capacitance         |
     |               built in potential                             |
     |mjsw           Source drain side junction capacitance         |
     |               grading coefficient                            |
     |cj             Source drain bottom junction capacitance       |
     |               per unit area                                  |
     |cjsw           Source drain side junction capacitance         |
     |               per unit area                                  |
     |wdf            Default width of source drain diffusion in um  |
     |dell           Length reduction of source drain diffusion     |
      ---------------------------------------------------------------