P4.8. NMOS Circuit with Body Effect

Components

Use RS from NMOSgamma.vi.

Procedure

  • Set RS. Install SPICE parameters from NMOSparam.vi and NMOSgamma.vi. Run NMOS_Cir.vi to obtain ID versus VGS with a sweep of VSS. The iteration solution obtained in SPICEgamma.vi (Diagram below) is compared in the graph of NMOS_Cir.vi. Adjust VSSinit to obtain IDmin of about 50μA. Re-adjust Gamma for best fit. Then save a data file with your data file name. The data file must be in the folder with the Mathcad file. The file name must have a *.prn extension.

  • A file can be obtained from the graph of the defaulted and saved VI using XY1toDataFile.vi. The VI XY1toDataFile.vi is located in \LabVIEW 6User.libDat_FilesDat.llb.

  • Note that XY1toDataFile.vi is different from XYtoDataFile2.vi, as used to obtain a data file in the Diagram of NMOS_Cir.vi. The Control Graph of XYtoDataFile2.vi accepts single plots while XY1toDataFile.vi is for graphs with two Y functions (with only one Y function in the data file). For convenience, a copy of XY1toDataFile.vi, GetDataFile.vi, is included in the Project04.llb. For clarification, XY1Y2toDataFile.vi accepts graph data with two Y functions and includes both in the data file.


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