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Basis of 3.7V & 4.2V mobile battery?
Since no reasonable series voltage combination satisfies
Nv=3,7; Mv=4,2 how are these strange voltages achieved, and why? What semiconductor technology do modern mobiles use: bipolar, CMOS ... or what? Where are these topics documented? TIA. |
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Basis of 3.7V & 4.2V mobile battery?
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Basis of 3.7V & 4.2V mobile battery?
wrote:
Since no reasonable series voltage combination satisfies Nv=3,7; Mv=4,2 how are these strange voltages achieved, and why? What semiconductor technology do modern mobiles use: bipolar, CMOS ... or what? Where are these topics documented? TIA. Keyword: electrochemistry Sites: # Practical details of batteries https://batteryuniversity.com/learn/...ased_batteries # "Characteristics hexagon" for battery chemistries, why we use them https://batteryuniversity.com/index....of_lithium_ion # Details of charging https://batteryuniversity.com/learn/..._ion_batteries # whizzy chemistry https://en.wikipedia.org/wiki/Lithium_battery # list of battery types https://en.wikipedia.org/wiki/List_of_battery_types # good stable but half-capacity tech, yard lamps https://en.wikipedia.org/wiki/Lithiu...sphate_battery # LiCoO2 is mentioned here, a high capacity but not entirely stable cell. # Since Cobalt is expensive, other materials are used to cut the cells. # Probably no Wikipedia article tracks latest chem evolution for these. # You would need some sort of science journal. Like maybe electrochemistry. https://en.wikipedia.org/wiki/Compar..._battery_types ******* Modern mobiles are mostly CMOS. Bipolar for RF amps and radio stuff. You can do radios in CMOS, but bipolar lasts longer (stable characteristic). Doing radios in CMOS is "abuse" (and this is not from direct engineering knowledge, just from observing how long CMOS-only products last, which is about three months before the RF power level drops). BiCMOS was discontinued some time ago, but is a great technology for the engineers who used it. You could drive a 50 ohm line with the stuff. HBT will run at 100GHz, but is not practical for computing, nor does Moores law apply. Features are on the order of 2 microns. CMOS is cheap, which is why we use it. And human psychology is such, they will optimize the hell out of it, just to make Moores law continue to hold. The documentation is, well... everywhere. Paul |
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