Abstract
A change in temperature can affect the performance and characteristics of a circuit. The components most affected by a change in temperature include semiconductors, resistors, capacitors, and inductors. All of these components have an inbuilt temperature dependence model parameter such that performing a temperature sweep will change component and subsequent circuit behavior. The temperature coefficients specified for resistors are given in parts per million per degree Celsius (ppm/°C). In previous versions of OrCAD, the temperature coefficients were not readily available on the Capture parts therefore to add TC1 and TC2. Breakout parts as used for Monte Carlo analysis are used, where the temperature coefficients are added to the PSpice model definition. An AC, DC, or transient analysis is normally run using the default nominal temperature (TNOM) of 27_C, which is set in the simulation profile under the Options tab. TNOM is the default nominal temperature and is also the temperature at which model parameters were measured. If users want to run a transient analysis at a different temperature then they need to specify the simulation temperature by selecting Temperature (Sweep) in the simulation profile and then entering either a single simulation temperature or a list of temperatures values.
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