Digital electronics
Digital electronics represent signals by discrete bands of analog levels, rather than by a continuous range. All levels within a band represent the same signal state. Relatively small changes to the analog signal levels due to manufacturing tolerance, signal attenuation or parasitic noise do not leave the discrete envelope, and as result are ignored by signal state sensing circuitry.
In most cases the number of these states is two, and they are represented by two voltage bands: one near zero volts and a higher level near the supply voltage, corresponding to the "false" ("0") and "true" ("1") values of the boolean domain respectively.
Digital techniques are useful because it is easier to get an electronic device to switch into one of a number of known states than to accurately reproduce a continuous range of values.
Digital electronic circuits are usually made from large assemblies of logic gates, simple electronic representations of Boolean logic functions
Advantages
There are various advantages of digital signals over analog signals. Some of them are;
Signals represented digitally can be transmitted without degradation due to noise.
In a digital system, a more precise representation of a signal can be obtained by using more binary digits to represent it.
Information storage can be easier in digital systems than in analog ones.
Disadvantages
Digital circuits use more energy than analog circuits to accomplish the same tasks.
Digital circuits are sometimes more expensive, especially in small quantities.
Most useful digital systems must translate from continuous analog signals to discrete digital signals. This causes quantization errors.
References
Sedra and Smith, Microelectronic Circuits, Fourth Edition, Oxford University Press Inc, UK, [1998]
IEEE Dictionary of Electrical and Electronics Terms ISBN 978-0-471-42806-0
Null, Linda; Lobur, Julia (2006). The essentials of computer organization and architecture. Jones & Bartlett Publishers. p. 121. ISBN 0763737696.
Digital electronics represent signals by discrete bands of analog levels, rather than by a continuous range. All levels within a band represent the same signal state. Relatively small changes to the analog signal levels due to manufacturing tolerance, signal attenuation or parasitic noise do not leave the discrete envelope, and as result are ignored by signal state sensing circuitry.
In most cases the number of these states is two, and they are represented by two voltage bands: one near zero volts and a higher level near the supply voltage, corresponding to the "false" ("0") and "true" ("1") values of the boolean domain respectively.
Digital techniques are useful because it is easier to get an electronic device to switch into one of a number of known states than to accurately reproduce a continuous range of values.
Digital electronic circuits are usually made from large assemblies of logic gates, simple electronic representations of Boolean logic functions
Advantages
There are various advantages of digital signals over analog signals. Some of them are;
Signals represented digitally can be transmitted without degradation due to noise.
In a digital system, a more precise representation of a signal can be obtained by using more binary digits to represent it.
Information storage can be easier in digital systems than in analog ones.
Disadvantages
Digital circuits use more energy than analog circuits to accomplish the same tasks.
Digital circuits are sometimes more expensive, especially in small quantities.
Most useful digital systems must translate from continuous analog signals to discrete digital signals. This causes quantization errors.
References
Sedra and Smith, Microelectronic Circuits, Fourth Edition, Oxford University Press Inc, UK, [1998]
IEEE Dictionary of Electrical and Electronics Terms ISBN 978-0-471-42806-0
Null, Linda; Lobur, Julia (2006). The essentials of computer organization and architecture. Jones & Bartlett Publishers. p. 121. ISBN 0763737696.
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