Dale - Computer Science Illuminated 123

Dale - Computer Science Illuminated 123 - 96 Chapter 4...

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Transistor A device that acts either as a wire or a resistor, depending on the voltage level of an input signal Semiconductor Mate- rial such as silicon that is neither a good conductor nor insulator 96 Chapter 4 Gates and Circuits Figure 4.7 Various representations of a three-input AND gate Logic Diagram Symbol Boolean Expression Truth Table 1 0 – 6 7 6 C AB 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 C 0 1 0 1 0 1 0 1 X 0 0 0 0 0 0 0 1 A B C X 4.3 Constructing Gates Before we examine how gates are connected to form circuits, let’s examine, at an even more basic level, how a gate is constructed to control the flow of electricity. Transistors A gate uses one or more transistors to establish how the input values map to the output value. A transistor is a device that acts, depending on the voltage level of an input signal, either as a wire that conducts electricity or as a resistor that blocks the flow of electricity. A transistor has no moving
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