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The semiconductor diode model can be used for either junction diodes or Schottky barrier diodes. 1.1.2 Device Models for Analog Simulation For transient analysis, the circuit response, including reactive elements, is analyzed to calculate the behavior of the circuit as a function of time.
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The simulator output in this case includes amplitudes and phases as a function of frequency. For AC analysis, the simulator determines the response of the circuit, including reactive elements to small-signal sinusoidal inputs over a range of frequencies. This is simply the repeated application of DC analysis over a range of DC levels for the input sources. Swept DC analysis may also be accomplished with ngspice.
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For DC analysis, the time-varying behavior of reactive elements is neglected and the simulator calculates the DC solution of the circuit. Analysis modes include DC analysis, AC analysis, and transient analysis. In addition to specifying sources, the user must define the type of simulation to be run.
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Ngspice offers a variety of source types including DC, sine-wave, and pulse. The response of a circuit is a function of the applied sources.