By G. D. Bishop (auth.)
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During this ebook the writer extends the thoughts formerly brought in his "Quantum box concept in Condensed topic Physics" to events within which the robust digital correlations are an important for the knowledge of the saw phenomena. ranging from a version box thought to demonstrate the elemental principles, extra advanced platforms are analysed in flip.
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Additional info for Electronics for Technicians
The line drawn through these points is termed the pinch-off limit. P,. 12. The MOSFET has very high input impedance, and this causes problems of handling MOSFETs since any stray or static voltage present will destroy the channel ; protection circuits are normally included to protect the transistor. -------1 1----. drain + , . . - - - -...... - - - -... 12 Cross-section through a MOSFET, (a) n-channel enhancement type (normally off), (b) n-channel depletion type (normally on) The operation of the MOSFET is very different from that of the JUGFET, since the channel section is not inserted into the transistor during manufacture ; it is created below the oxide layer and the gate due to capacitor action .
12 Cross-section through a MOSFET, (a) n-channel enhancement type (normally off), (b) n-channel depletion type (normally on) The operation of the MOSFET is very different from that of the JUGFET, since the channel section is not inserted into the transistor during manufacture ; it is created below the oxide layer and the gate due to capacitor action . When the gate goes positive with respect to the source (also connected to the substrate), electrons in the substrate are attracted to the holes repelled from the oxide interface by polarisation, thereby creating an n-type layer called an inversion layer under the dielectric between source and drain .
Unipolar transistors rely on the flow of just one type of carrier, namely electrons or holes . Field-effect transistors (FETs) belong to this second family along with unijunction transistors , although the unijunction transistor is not an amplifying type of transistor; it is used merely as a switch in a similar way to the thyristor. There are many circuit applications where npn or pnp transistors are best suited; in a similar way there are many applications where FETs are best suited. ------;::::~11;::::==:~~1===:=Ff-----' I depletion !
Electronics for Technicians by G. D. Bishop (auth.)