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There is partial support for a couple of HFET models and one model for MESA devices. Silicon-on-insulator MOS transistors are described by the SOI models from the BSIMSOI family ( Berkeley BSIMSOI web page) and the STAG one. The recent MOS models for submicron devices are the BSIM3 ( Berkeley BSIM3 web page) and BSIM4 ( Berkeley BSIM4 web page) models.
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MOS2, MOS3, and BSIM include second-order effects such as channel-length modulation, subthreshold conduction, scattering-limited velocity saturation, small-size effects, and charge controlled capacitances. All the original six MOSFET models are implemented: MOS1 is described by a square-law I-V characteristic, MOS2 is an analytical model, while MOS3 is a semi-empirical model MOS6 is a simple analytic model accurate in the short channel region MOS9, is a slightly modified Level 3 MOSFET model - not to confuse with Philips level 9 BSIM 1 BSIM2 are the old BSIM (Berkeley Short-channel IGFET Model) models. There are two models for JFET: the first (JFET) is based on the model of Shichman and Hodges, the second (JFET2) is based on the Parker-Skellern model. 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. 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. 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.
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