MOS Model 20 is an old compact LDMOS model, which combines the MOSFET operation of the channel region with that of the drift region under the thin gate oxide. As such, it was aimed as a successor of MOS model 9 in series with MOS model 31 or MOS model 11 in series with MOS model 31. MOS Model 20 improved the convergence behaviour during simulation, by having the voltage at the transition from the channel region to the drift region calculated inside the model itself. The model has been discontinued after SiMKit 3.8 as newer models have been built within NXP®.
The models are included in a dynamically loaded library called SiMKit (available until SiMKit 3.8). SiMKit is related to the following circuit simulators used within NXP:
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