I believe hard switching is fast on/off times with inductive loads. The fast rise and fall may create voltage spikes.
There are devices called thyristors which are used for switching purposes in high voltage levels. Thyristors are of different typesSCRIGBDiacTriac, etc.Apart from these MOSFETs, a type of transistor, are also used in high voltage switching applications.
switching losses
Because of threshold voltage reduction of MOSFETs. Comparing with metals for the gate of MOSFETs, polysilicon has small work function difference with the substrate silicon of MOSFETs.
hard switching is a switch which can be purchased in a hardware shop... properties: it is hard it is not soft it is very compact it is not a eatable it is not advisable for children under age 5
MOSFETs
MOSFET stands for Metal Oxide Semiconductor Field Effect Transistor, It is broadly Classified into Depletion type MOSFETS and Enhancement type MOSFETS. Depletion type MOSFETS are further classified into P-Channel and N-Channel Depletion type MOSFET, Similarly Enhancement type MOSFETS are further classified into P-Channel and N-Channel Enhancement type MOSFET.
nothing
No. Mosfets are used for their switching capabilities more then amplification purposes if anything. for Pulse width modulation, power supplies, for certain frequencys, and smoothing out power sources, signals, and PWM can be used in class D amplifiers as well to have a very good efficiency.
ZVS techniques are techniques that force the voltage across a switch to be zero just before it is turned on or off and to keep this voltage zero while a switching transition occurs. All MOSFETs and most IGBTs have anti-parallel diodes that are built into the body of each device that allows current to flow from source to drain in a MOSFET and from emitter to collector in an IGBT. A ZVS turn-on in MOSFETs and IGBTs is therefore done by forcing current through the body-diode of the devices just before they are turned on. This clamps the voltage across the device to a single diode drop (which is a negligible voltage) during a switching transition so that turn-on switching losses are greatly reduced. A ZVS turn-off is achieved by slowing down the rate of voltage rise across a switch when it is turned off by adding some capacitance across the switch; this limits the overlap between voltage and current during the switching transition
Mosfets should be protected from static electricity. Handle with anti static protection. Use solder-wicks when desoldering as solder-suckers create enough static electricity to damage mosfets. Also susceptible to over voltage. A mosfet will break if a short cuircuit happens thru it and blow other paralleled mosfets too.
CMOS is better than single MOSFETs because the complementary MOSFETs in CMOS always have one off and the other on, reducing the idle current to only leakage current and the output voltage exactly equal that of either the power or ground as there is no voltage drop across the MOSFET that is on. With just one MOSFET the device draws current anytime it is in the on state, even if idle.
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