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  1. Guru

    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 a 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.

  2. Guru

    Advantages of Digital Techniques
    Easier to design. Exact values of voltage or current are not important, only the range (HIGH or LOW) in which they fall.
    Information storage is easy.
    Accuracy and precision are greater.
    Operations can be programmed. Analog systems can also be programmed, but the available operations variety and complexity is severely limited.
    Digital circuits are less affected by noise, as long as the noise is not large enough to prevent us from distinguishing HIGH from LOW (we discuss this in detail in an advanced digital tutorial section).
    More digital circuitry can be fabricated on IC chips.






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