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transistors - Large SiGe ASICs for digital logic - Electrical . . . Are SiGe NPN transistors used to build digital gates? Yes This is done either for very simple, small logic, when you might need a few hundred control gates in a power amplifier or similar (and you can save the cost of the BiCMOS part in the process), or when logic needs to be really fast (for example in some of the building blocks in PLLs)
How do I get a bigger sheet size in Altium, updating current one? I have a schematic sheet and I need more free space on it The actual size is A4 I have right-clicked in the sheet, went to Preferences and changed the Sheet Size from A4 to A3 but that does not m
How close are we to fabricating a germanium IC? 5 I am not actually talking here about SiGe (silicon-germanium hybrids) but an integrated circuit that uses entirely Germanium (doped of course in certain areas)? It is my understanding that even though germanium was used to make the first discrete transistors, there are many problems with using it as a substrate for IC fabrication
materials - When to use which semiconductor? - Electrical Engineering . . . High carrier mobility, which allows higher frequency devices For this you'll see materials like SiGe, GaAs, GaN, or InP used A specific lattice constant, for growing one material epitaxially on a substrate of another material The ability to engineer both lattice constant and bandgap is why you see ternary and quaternary compounds like
Change the sheet size shape in Altium PCB editor The " Sheet " layer is just like any other mechanical layer (see the " View Configuration " panels -> " Layers Colors "), and you'll probably need to add it manually unless you have a template setup After drawing an outline, uncheck and re-check the " Get Size From Sheet Layer " box (or close re-open the PCB), and Altium will then use the extremes of whatever you place on that layer for the
bjt - Why do some transistor packages have multiple leads for the . . . There's more than one reason that might be done It would help if you would edit your question with a link to the datasheet for the exact transistor you wish to use, then it will be more apparent why it was done for that transistor
Is \\$f_{\\text{hfe}}\\$ independent of BJT capacitances? This explains why there are Silicon-Germanium (SiGe) based Bipolar Junction Transistors which have a higher \$f_ {\text {hfe}}\$ The SiGe has higher mobility resulting in faster transistors
Why dont we use GaN transistors everywhere? Compare it to SiGe (Silicon Germanium) which has been available for many years It has faster (bipolar) transistors Is it used everywhere? No, because few ICs use bipolar transistors 99% of today's ICs use CMOS transistors only making SiGe manufacturing processes a niche application The same is true for GaN, it's only useful for Power