21-12-2012, 05:16 PM
Digital Electronics Basics: Combinational Logic
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Digital versus analog
So far, our discussion about electronics has been predominantly “analog”,
which is concerned with continuously changing signals—signals whose values
at different times are useful information.
There is another form of signals which is nowadays very important and is
being used in an overwhelming number of applications—DIGITAL.
A digital signal assumes just a few analog values. For example, binary signals
have two values, e.g., 0V and 5V. They transmit information in the form of a
sequence of 0V and 5V segments.
Logic
What can a digital circuit do?
The simplest task we can think of is a combinational type of logic decision.
For example, we can design a digital electronic circuit to make an instant decision
based on some information. Here we emphasize “instant” in the decision making
process. That means, the process has no time delay.