cp1_lect_5 - Logic Gates and Combinational • An electric...

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Unformatted text preview: 5/10/10 Logic Gates and Combinational • An electric circuit – switches between insulator (open circuit) and conductor (closed circuit) – We can call the presence of a voltage “1” and its absence “0” 5/10/10 Transistors • An electronic switch that is open or closed between the source and the drain depending on the voltage on the gate . (n-type MOS) (In a Circuit) (Shorthand notation) 5/10/10 Metal Oxide Semiconductor Transistors (Basic Structure) 5/10/10 A B G N Open (insulating) if gate is “off” = 0 Closed (conducting) if gate is P Open (insulating) if gate is “on” = 1 Closed (conducting) if gate is “off” = A B G CMOS Transistors • CMOS – Complementary Metal-Oxide Semiconductor – Both n-channel and p-channel devices can be fabricated on the same substrate – Standard type for digital applications 5/10/10 Logic Gates • Digital symbols: – Recall that we assign a range of analog voltages to each digital (logic) symbol – Assignment of voltage ranges depends on electrical properties of transistors being used • Typical values for "1": +5V, +3.3V, +2.9V 5/10/10 2.9 v 0 v out in In Out 1 1 Inverter Gate P N (NOT) Out In 5/10/10...
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cp1_lect_5 - Logic Gates and Combinational • An electric...

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