10/13/2019 Bzx85c12-tap Spice Model
The SPICE circuit simulation program provides for modeling diodes in circuit simulations. The diode model is based on characterization of individual devices as described in a product data sheet and manufacturing process characteristics not listed. Some information has been extracted from a 1N4004 data sheet in Figure.Data sheet 1N4004 excerpt, after.The diode statement begins with a diode element name which must begin with “d” plus optional characters. Example diode element names include: d1, d2, dtest, da, db, d101. Two node numbers specify the connection of the anode and cathode, respectively, to other components. The node numbers are followed by a model name, referring to a subsequent “.model” statement.The model statement line begins with “.model,” followed by the model name matching one or more diode statements.
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Next, a “d” indicates a diode is being modeled. The remainder of the model statement is a list of optional diode parameters of the form ParameterName=ParameterValue. None are used in Example below. Example2 has some parameters defined.
For a list of diode parameters, see Table.General form: dname anode cathode modelname.model (modelname d parmtr1=x parmtr2=y.)Example: d1 1 2 mod1.model mod1 dExample2: D2 1 2 Da1N4004.model Da1N4004 D (IS=18.8n RS=0 BV=400 IBV=5.00u CJO=30 M=0.333 N=2)The easiest approach to take for a SPICE model is the same as for a data sheet: consult the manufacturer’s web site. Table lists the model parameters for some selected diodes. A fallback strategy is to build a SPICE model from those parameters listed on the data sheet.
A third strategy, not considered here, is to take measurements of an actual device.
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