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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)
Why are microprocessors made using silicon and not germanium? I heard that microprocessors are usually made using silicon, yet germanium has a better conductive state Why isn't germanium not chosen instead, taking to account that better conductors provide be
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
Why does MOSFET pinch-off occur? - Electrical Engineering Stack Exchange Your description is correct: given that VGS> VT V G S> V T, if we apply a Drain-to-Source voltage of magnitude VSAT = VGS −VT V S A T = V G S V T or higher, the channel will pinch-off I'll try to explain what happens there I'm assuming n-type MOSFET in the examples, but the explanations also hold for p-type MOSFET (with some adjustments, of course) The reason for pinch-off: Think about
What is the standard procedure for analogue IC tapeout? One generality that matters a lot to analog ICs: compared to discrete components their components are far less accurate, but far more precisely matched This means that a lot of constructs that work well in discrete designs fall flat on their face in an integrated circuit, and vice versa In general for ICs you want to design things such that what matters is the ratio between components
Highest speed of operation [BJT vs MOSFET] [closed] You can make SiGe bipolar transistors (on a chip) with ft's approaching 100GHz, and 4000 series CMOS (enhancement mode MOSFETS) that struggle to switch at 5MHz with low supply voltage
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