Junction Field-Effect Transistor (JFET) Model
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1 Junction Field-Effect Transistor (JFET) Model Old Content - visit altiumcom/documentation Mod ifi ed by Phi l Lou ghh ead on 4- Mar Model Kind Transistor Model Sub-Kind JFET SPICE Prefix J SPICE Netlist Template %1 %2 &"AREA FACTOR" &"STARTING CONDITION"?"INITIAL D-
2 S VOLTAGE" D-S G-S VOLTAGE"?TEMPERATURE Parameters (definable at component level) The following component-level parameters are definable for this model type and are listed on the Parameters tab of the Sim Model dialog To access this dialog, simply double-click on the entry for the simulation model link in the Models region of the Component Properties dialog Area Factor Starting Condition specifies the number of equivalent parallel devices of the specified model This setting affects a number of parameters in the model set to OFF to set terminal voltages to zero during operating point analysis Can be useful as an aid in convergence Initial D-S Voltage time-zero voltage across Drain-Source terminals (in Volts) Initial G-S Voltage time-zero voltage across Gate-Source terminals (in Volts) Temperature temperature at which the device is to operate (in Deg C) 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) Parameters (definable within model file) The following is a list of parameters that can be stored in the associated model file: VTO threshold voltage VTO (in Volts) (Default = -20) BETA transconductance parameter β (in A/V 2 ) (Default = 10e-4) LAMBDA channel-length modulation parameter λ (in 1/V) (Default = 0) RD drain ohmic resistance (in Ohms) (Default = 0) RS source ohmic resistance (in Ohms) (Default = 0) CGS zero-bias G-S junction capacitance C GS (in Farads) (Default = 0) CGD zero-bias G-D junction capacitance C GD (in Farads) (Default = 0) PB gate junction potential (in Volts) (Default = 1) IS gate junction saturation current I S (in Amps) (Default = 10e-14) B doping tail parameter (Default = 1) KF flicker noise coefficient (Default = 0) AF flicker noise exponent (Default = 1) FC coefficient for forward-bias depletion capacitance formula (Default = 05) TNOM parameter measurement temperature (in C) - 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) Notes 1 The model for the JFET is based on the FET model of Shichman and Hodges 2 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
3 3 the Analyses Setup dialog The Area Factor affects the following model parameters: transconductance parameter (BETA) drain ohmic resistance (RD) source ohmic resistance (RS) zero-bias G-S junction capacitance (CGS) zero-bias G-D junction capacitance (CGD) gate junction saturation current (IS) 4 If the Area Factor is omitted, a value of 10 is assumed 5 The link to the required model file (*mdl) is specified on the Model Kind tab of the Sim Model dialog The Model Name is used in the netlist to reference this file 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 default should be applicable to most simulations Generally you do not need to change this value Examples Consider the JFET in the above image, with the following characteristics: Pin1 (Drain) is connected to net D Pin2 (Gate) is connected to net G Pin3 (Source) is connected to net S Designator is J1 The linked simulation model file is 2N4393mdl If no values are entered for the parameters in the Sim Model dialog, the entries in the SPICE netlist would be:
4 *Schematic Netlist: J1 D G S 2N4393 *Models and Subcircuit: MODEL 2N4393 NJF(VTO=-1422 BETA= LAMBDA=0006 RD=1 RS=1 CGS=406E-12 + CGD=457E-12 IS=2052E-13 KF=123E-16 ) and the SPICE engine would use the indicated parameter information defined in the model file, along with default parameter values inherent to the model for those parameters not specified in the file If the following parameter values were specified on the Parameters tab of the Sim Model dialog: Area Factor = 4 Temperature = 29 then the entries in the SPICE netlist would be: *Schematic Netlist: J1 D G S 2N TEMP=29 *Models and Subcircuit: MODEL 2N4393 NJF(VTO=-1422 BETA= LAMBDA=0006 RD=1 RS=1 CGS=406E-12 + CGD=457E-12 IS=2052E-13 KF=123E-16 ) In this case, the SPICE engine would use this information, in conjunction with the indicated parameters defined in the model file (and any defaults for parameters not specified) PSpice Support To make this device model compatible with PSpice, the following additional model parameters are supported and can be entered into a linked model file (*mdl) for the device: ALPHA ionization coefficient (in Volt-1) (Default = 0) BETATCE BETA exponential temperature coefficient (in Amp/Volt2) (Default = 1E-4) ISR gate p-n recombination current parameter (in Amps) (Default = 0) M gate p-n grading coefficient (Default = 05) N gate p-n emission coefficient (Default = 1) NR emission coefficient for isr (Default = 2) VK ionization knee voltage (in Volts) (Default = 0) VTOTC VTO temperature coefficient (in Volt/ C) (Default = 0) XTI IS temperature coefficient (Default = 3) Where a parameter has an indicated default, that default will be used if no value is specifically entered The format for the PSpice model file is:
5 MODEL ModelName NJF(Model Parameters) - N-channel JFET MODEL ModelName PJF(Model Parameters) - P-channel JFET where ModelName is the name of the model, the link to which is specified on the Model Kind tab of the Sim Model dialog This name is used in the netlist (@MODEL) to reference the required model in the linked model file Model Parameters are a list of supported parameters for the model, entered with values as required The following parameters - common to most devices in PSpice - are not supported: T_ABS T_MEASURED T_REL_GLOBAL T_REL_LOCAL For an example of using a PSpice-compatible diode model in a simulation, refer to the example project JFETPrjPCB Source URL:
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