Reverse breakdown is modeled by an exponential increase in the reverse diode current and is determined by the parameters Bv (reverse breakdown voltage) and Ibv (current at reverse breakdown voltage). A window opens that listing the parts in the library: Figure 11. OrCad Capture Icon Next, go to File, Open, Library, and browse to the location of THS4131.olb. However, an optional part of the Ngspice, Xyce and SPICE OPUS subcircuit netlist syntax that signifies that a parameter extension is present is not. In a similar fashion to Qucs, the Ngspice, Xyce and SPICE OPUS circuit simulators allow subcircuits with or without parameters. Double click on the capture icon: Figure 10. Spice4qucs supports all the features available with Qucs subcircuits. They have been widely employed in linear circuit design since they. The nominal temperature at which these parameters were measured is Tnom. capture library with a single part in itthe THS4131. Operation amplifiers (OP AMP) are a fundamental building block of linear elec- tronics. The temperature dependence of the saturation current is defined by the parameters Eg, the energy bandgap and Xti, the saturation current temperature exponent. Charge storage effects are modeled by a transit time, Tt, and a nonlinear depletion layer capacitance which is determined by the parameters Cj0 (zero-bias junction capacitance), Vj (junction potential), and M (grading coefficient). The dc characteristics of the diode are determined by the parameters Is (saturation current) and N (emission coefficient). In this case, the LED is based on the model parameters for the PN Junction Diode, which are documented in the appropriate section of the technical documentation: You do need to understand how the models work though. If you look at the entries in the existing 'LEDs' library (LEDS.lib in subfolder Qucs\share\qucs\library of my Windows Qucs installation) you will see how these are defined.
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