Digital Electronics
refers to the field of electronics that deals with digital signals,
i.e., signals that exist at discrete or quantized levels only. In
fact, digital electronics as known today deals with signals that are
represented by only two discrete levels or 'binary states': 1 and 0.
A level '0', or 'low' state, may be represented by zero volt (0 V),
while a level '1', or 'high' state, may be represented by a higher
voltage, say 5 V.
Digital
electronics involves the storage, processing, receiving, and
transmission of information in the form of digital signals, or a train
of 'low' (0 V) and 'high' (5 V) pulses that correspond to 0's and 1's,
respectively.
The opposite
of a digital signal is an analog signal, which
is defined as a varying and continuous signal.
Digital
signals may be converted into analog signals and vice versa by devices
known as
digital-to-analog converters (DAC's)
and
analog-to-digital converters (ADC's) ,
respectively.
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