Disadvantages of analog systems
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The primary disadvantage of analog signaling is that any system has noise, that is random disturbances or variations in it. As the signal is copied and re-copied, or transmitted over long distances, these random variations become dominant and lead to signal degradation. Electrically these losses are lessened by shielding, good connections, and several cable types such as coax and twisted pair and using low noise amplifiers. The effects of random noise can make signal loss and distortion impossible to recover, since amplifying the signal to recover attenuated parts of the signal often generates more noise and amplifies the noise as well.
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Sources: Some of an earlier version of this article was originally taken from Federal Standard 1037C in support of MIL-STD-188.
Analog circuit functions: Analog multipliers, electronic amplifiers, electronic filters, electronic oscillators, Phase-locked loops, electronic mixers, Power conversion, Electronic Power Supply, impedance matchers, operational amplifiers, comparators, Voltage regulators
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Digital electronics is based on a number of discrete voltage levels, usually two, as distinct from Analog electronics which uses voltages to represent variables directly. Digital circuits are the most common mechanical representation of Boolean algebra and are the basis of all digital computers. They can also be used to process digital information without being connected up as a computer. Such circuits are referred to as "random logic".
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In most cases the number of states is two, and these states are represented by two voltage levels: one near to zero volts and one at a higher level depending on the supply voltage in use. These two levels are often represented as "Low" and "High
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