# Ch3 - Chapter 3 3.1 The Transistor o MOS stands for...

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Chapter 3 3.1: The Transistor o MOS stands for medal-oxide Semiconductor o There are two types of MOS transistors: p-type and n-type, and they both operate “logically” o N-type transistor connection is broken if supplied with 0 volts and is closed like a wire if supplied with 2.9 volts. o P-type transistor acts the opposite. o They are complementary, and circuits that contain both types are CMOS circuits, for Complementary Metal-Oxide semiconductor. 3.2: Logic Gates o Logic gates are transistor circuits that implement the AND, OR, and NOT functions. o 3.2.1: The NOT Gate (Inverter) Constructed from two MOS transistors, one p-type and one n-type. The p-type transistor conducts and the n-type does not if supplied with 0 volts, and the opposite happens when supplied with 2.9 volts. The output is therefore connected to 2.9 volts with 0 volts given and 0 volts with 2.9 volts given. o 3.2.2: OR and NOR Gates NOR gate is composed of two p-type and n-type transistors. Output gives 2.9 volts only give A and B are zero volts. OR is the opposite of NOR. o 3.2.3: AND and NAND Gates AND and NAND are opposites. Triangle: Inverter Pill: AND gate Shield: OR gate Pill w/ circle on end: NAND gate Shield w/ circle on end: NOR gate o 3.2.4: DeMorgan’s Law The NOT of A AND B is A OR B o 3.2.5: Larger Gates You can use a multiple-input gate. 3.3: Combinatorial Logic Circuits o There are fundamentally two kinds of logic structures, those that include the storage of information and those that do not. o Structures that do not store information are referred to as decision elements or combinational logic structures , because their outputs are strictly dependent on the combination of input values that are being applied to the structure right now. Their outputs are not at all dependent on any past history of information. o

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## This note was uploaded on 04/07/2008 for the course CS 310 taught by Professor Fussell during the Spring '08 term at University of Texas.

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Ch3 - Chapter 3 3.1 The Transistor o MOS stands for...

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