If no values are entered for the parameters in the Sim Model dialog, the entries in the SPICE netlist would be: The linked simulation model file is 2N4393.mdl.Generally you do not need to change this value.Ĭonsider the JFET in the above image, with the following characteristics: The default should be applicable to most simulations. Where a parameter has an indicated default (as part of the SPICE model definition), that default will be used if no value is specifically entered. The Model Name is used in the netlist to reference this file. The link to the required model file ( *.mdl) is specified on the Model Kind tab of the Sim Model dialog.If the Area Factor is omitted, a value of 1.0 is assumed.zero-bias G-D junction capacitance ( CGD).zero-bias G-S junction capacitance ( CGS).The Area Factor affects the following model parameters:.The values for the Initial D-S Voltage and Initial G-S Voltage only apply if the Use Initial Conditions option is enabled on the Transient/Fourier Analysis Setup page of the Analyses Setup dialog.
The model for the JFET is based on the FET model of Shichman and Hodges.If no value is specified, the default value assigned to TNOM on the SPICE Options page of the Analyses Setup dialog will be used (Default = 27). (Default = 1.0e-14).Ĭoefficient for forward-bias depletion capacitance formula (Default = 0.5). Gate junction saturation current I S (in Amps). Zero-bias G-D junction capacitance C GD (in Farads). Zero-bias G-S junction capacitance C GS (in Farads). (Default = 0).ĭrain ohmic resistance (in Ohms). (Default = 1.0e-4)Ĭhannel-length modulation parameter λ (in 1/V). Transconductance parameter β (in A/V 2 ).
The following is a list of parameters that can be stored in the associated model file: If no value is specified, the default value assigned to TEMP on the SPICE Options page of the Analyses Setup dialog will be used (Default = 27). Temperature at which the device is to operate (in Deg. Time-zero voltage across Gate-Source terminals (in Volts). Time-zero voltage across Drain-Source terminals (in Volts). Set to OFF to set terminal voltages to zero during operating point analysis. This setting affects a number of parameters in the model. Specifies the number of equivalent parallel devices of the specified model. To access this dialog, simply double-click on the entry for the simulation model link in the Models region of the Component Properties dialog.
The following component-level parameters are definable for this model type and are listed on the Parameters tab of the Sim Model dialog. J SPICE Netlist Template %1 %2 %3 &"AREA FACTOR" &"STARTING CONDITION" ?"INITIAL D-S D-S VOLTAGE", G-S VOLTAGE"| Parameters (definable at component level)
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