Use subthreshold operation as the fundamental case Sub-VT operation simplifies this 2D problem to 2 1D problems Allows intuition across sub-VT and above-VT operationġ0 Channel Current Dependence on Gate Voltage (n-well) CMOS Process = nFETs and pFETs are available all p-n junction must be reversed bias We create a silicon-oxide “stencil” (or mask) We get highly repeatable gates because the gate acts as a stencil as well N-type ND P-type NA First-Principles Modelĥ A MOSFET Transistor Source Drain Gate Drain Gate Source SubstrateĦ Self-Aligned Process How do we make a basic transistor element? lib files are Infineon's and subject to their licensing and usage terms which can be found in the text of each spice library.Ec qDV Ec E0 Ec Ef Case I: P(E) ~ exp( - E0 /kT) Case II: P(E) ~ exp( - ( E0 - qDV)/kT) Ratio of Case II to Case I = 1 P(E) = ~ e-(E-Ef)/kT 1 + e-(E-Ef)/kT exp( DV / UT ) UT = kT/qģ P-N Junctions Depletion Layer or Region N-type ND P-type NA qND Charge Original symbols of the LTspice Infineon NMOS Library are released under the MIT License.You should now be able to access the Infineon parts under 'InfineonNMOS' and 'InfineonPMOS'. To %USERPROFILE%\Documents\LTspiceXVII\lib\sub To %USERPROFILE%\Documents\LTspiceXVII\lib\sym\InfineonPMOS To %USERPROFILE%\Documents\LTspiceXVII\lib\sym\InfineonNMOS To C:\Program Files\LTC\LTspiceIV\lib\sub Copy the contents of LTspiceInfineonNMOSLibrary\sub.To C:\Program Files\LTC\LTspiceIV\lib\sym\InfineonPMOS Copy LTspiceInfineonNMOSLibrary\sym\InfineonPMOS.To C:\Program Files\LTC\LTspiceIV\lib\sym\InfineonNMOS Copy LTspiceInfineonNMOSLibrary\sym\InfineonNMOS.Into ~/Library/Application\ Support/Ltspice/lib/sub Copy the contents of the LTspiceInfineonNMOSLibrary/sub folder.Copy the LTspiceInfineonNMOSLibrary/sym/InfineonPMOS folder.Into ~/Library/Application\ Support/Ltspice/lib/sym Copy the LTspiceInfineonNMOSLibrary/sym/InfineonNMOS folder.Download LTspice Infineon NMOS Library.There are no encrypted symbols included unfortunately, but only a handful of Infineon's models use encryption so this is not too big an issue. LTSpice has no problem with PSpice libraries. When available, it uses their native LTSpice libraries, but when not, PSpice libraries are used. It uses Infineon's publically available libraries, but includes native LTSpice symbols, allowing for easy use and installation.
It is missing odd symbols such as power modules, dual MOSFETs, etc.
UPDATED August 3rd, 2022: LTspice Infineon NMOS Library is a semi-complete bundle of Infineon's Power N-Channel MOSFETs up to 950V, current as of August 3rd, 2022.
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