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The BSIM3 model is available with Pro and Elite versions. versions of SIMetrix. Three versions are supplied namely 3.1, 3.24 and 3.3. Our implementation of version 3.1 includes all bug fixes applied to the latest version but the device equations and supported parameters are for the original version 3.1. See below to find out how to switch versions.
BSIM3 models can be accessed using one of four values for the LEVEL parameter:
The following PSpice parameters are supported when using level 7: TT, L, W, RG, RD, RS, RB, RDS, JSSW
The following Hspice® parameters are supported when using level 49/53: CJGATE, HDIF, LDIF, WMLT, XL, XW, IS, N, NDS, VNDS, PHP, LMLT, CTA, CTP, PTA, PTP, TREF, RD, RS, RDC, RSC, CBD, CBS, FC, TT, LD, WD, EG, GAP1, GAP2, XLREF, XWREF, ACM, CALCACM, TLEV, TLEVC
The Hspice® noise model is also supported for NLEV=0,1 and 2.
The 'M' instance parameter has also been implemented with all variants. This specifies the number of equivalent parallel devices.
Additional temperature parameters: All variants support the TEMP and DTEMP instance parameters. TEMP specifies absolute temperature (Celsius) while DTEMP specifies the temperature relative to the circuit global temperature.
All variants support the model parameters T_MEASURED (equivalent to TNOM), T_ABS (as TEMP instance parameter) and T_REL_GLOBAL (as DTEMP instance parameter)
The VERSION parameter can be specified to select which version is used. As detailed above, SIMetrix supports three different BSIM3 versions although 8 versions have been released by Berkeley. The following table shows which version will actually be used according to the VERSION parameter value.
| VERSION parameter | Use BSIM3 Version |
|---|---|
| 3.0 | 3.1 |
| 3.1 | 3.1 |
| 3.2 | 3.24 |
| 3.21 | 3.24 |
| 3.22 | 3.24 |
| 3.23 | 3.24 |
| 3.24 | 3.24 |
| 3.3 | 3.3 |
| not specified | 3.3 |
The parameters describing BSIM3 are documented in the original Berkeley manual. See below. The following table lists parameters that are non-standard.
| Name | Description | Units | Default |
|---|---|---|---|
| TNOM, T_MEASURED | Reference temperature; the temperature at which the model parameters were measured | ° C | 27 |
| T_ABS | If specified, defines the absolute model temperature overriding the global temperature defined using .TEMP | ° C | .TEMP |
| T_REL_GLOBAL | Offsets global temperature defined using .TEMP. Overridden by T_ABS | ° C | 0.0 |
| VFBFLAG | Capacitor model selector used by Hspice. An error will be raised if this parameter and the CAPMOD parameter are set to values not supported by SIMetrix | 0 | |
| BINFLAG | Parameter used by Hspice. An error will be raised if this parameter is set to a value other than zero | 0 | |
| LREF | Ignored | ||
| WREF | Ignored | ||
| SFVTFLAG | Ignored | ||
| TT | Level = 7 only. Reverse diode transit time | S | 0.0 |
| L | Level = 7 only. Channel length. Overridden by instance parameter | m | DEFL option |
| W | Level = 7 only. Channel width. Overridden by instance parameter | m | DEFW option |
| RG | Level = 7 only. Gate resistance | 0.0 | |
| RD | Level = 7 only. Drain resistance | Ω | 0.0 |
| RS | Level = 7 only. Source resistance | Ω | 0.0 |
| RB | Level = 7 only. Bulk resistance | Ω | 0.0 |
| RDS | Level = 7 only. Drain-source leakage resistance | Ω | $\infty$ |
| JSSW | Level = 7 only. Alias for JSW. | F/m | 0.0 |
Original Berkeley documentation is provided on the CDROM and at our web site. Please visit Further Documentation for details.
BSIM3 devices may be binned according to length and width. Refer to Model Binning for details.
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