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Chapter0_gates-technology - Different Logic Families used...

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Different Logic Families used to implement Logic Gates . There are several different logic families used to implement basic AND/OR gates. Which specific family to use depends on the speed, density, power consumption, and other design constraints. The reader can refer to appropriate literature for actual design/operation of each logic family. Each family has its capabilities and limitations, its advantages and disadvantages. In what follows, we describe some major logic families and their characteristics. Diode Logic (DL) Diode logic gates use diodes to perform AND / OR logic functions. Diodes have the property of easily passing an electrical current in one direction, but not the other. Thus, diodes can act as a logical switch. Diode logic gates are very simple and inexpensive, and can be used effectively in specific situations. However, they cannot be used extensively, as they tend to degrade digital signals rapidly. In addition, they cannot perform a NOT function, so their usefulness is quite limited. Resistor-Transistor Logic (RTL) Resistor-transistor logic gates use Transistors to combine multiple input signals, which also amplify and invert the resulting combined signal. Often an additional transistor is included to re-invert the output signal. This combination provides clean output signals in either inversion or non-inversion case.
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