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Unformatted text preview: 1 Outline : • Special technique on hardware lab • More on MOS • Example on Boolean Algebra Elec Elec Elec Elec Elec Elec Elec Elec 151 Tutorial #4 151 Tutorial #4 151 Tutorial #4 151 Tutorial #4 151 Tutorial #4 151 Tutorial #4 151 Tutorial #4 151 Tutorial #4 Special Technique on the Hardware Lab p-n Junction s A junction between p-type and n-type semiconductor forms a diode s Current flows only in one direction anode cathode P N nMOS Transistor s Four terminals: gate (G), source (S), drain (D), body (B) s Gate–oxide–body stack looks like a capacitor s Gate and body are conductors s SiO 2 (oxide) is a very good insulator s Called metal – oxide – semiconductor (MOS) capacitor nMOS Operation s Body is usually tied to ground (0 V) s When the gate is at a low voltage s P-type body is at low voltage s Source-body and drain-body diodes are OFF s No current flows, transistor is OFF nMOS Operation (2/2) s When the gate is at a high voltage s Positive charge on gate of MOS capacitor...
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- Spring '10