- This section presents a more elaborate model of the MOSFET and can be skipped without loss of continuity.
- For a fixed VGS, we approximated the behavior as a linear resistor using the SR model.
- Clearly, the SR model does not capture MOSFET behavior if we vary VGS.
- Worse yet, even for a given value of VGS, the SR model becomes inaccurate as the value of VDS approaches VGS − VT.
- For more accuracy, we can develop a more elaborate model for the triode region operation of the MOSFET.
- Abandoning the piecewise-linear method, this more elaborate model characterizes the behavior of the MOSFET in the triode region as a nonlinear resistor, whose characteristics depend on VGS.
- When combined with the SCS model for the saturation region, the nonlinear resistor model in the triode region results in a continuous set of MOSFET curves.
- The resulting combined model for the triode and saturation regions is called the switch unified model or the SU model of the MOSFET.
Wednesday, March 30, 2011
7.8 Switch Unified (SU) MOSFET Model
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