What is the electronic system?
Digital electronic circuits are fundamentally the idea of a specific function. Let’s take an example to clarify the concept: for instance, we have an electronic circuit that performs the addition of two numbers. So, we have the idea, which is the process of adding numbers, and we have transformed this idea through several steps into an electronic circuit to which we provide the numbers to be added via the circuit’s inputs, and in return, it gives us the result through the circuit’s outputs. The same applies to all digital electronic circuits, which consist of multiple inputs and outputs and form a set of interconnected electronic circuits within the digital system.
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| electronic system |
presentation of logical functions
Each digital electronic circuit has a specific logical function, which determines the values that the outputs will take when certain values are provided to the inputs. Initially, the logical function is an idea written in text form, and it is the electronics engineer who transforms this function from mere description into an electronic circuit through several steps, which we will learn about in upcoming articles and lessons.
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truth table and karnaugh table
In the first step of creating electronic circuits with a specific function, the function must be represented in the form of a table called a truth table. This table contains columns for the inputs, which cover all possible logical combinations that can be entered, as well as columns for the outputs, which take on logical states representing the logical function.
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| truth table |
It is also possible to represent the table in another way with the same data, inputs, and outputs, and this table is called a Karnaugh map. Its function is to allow us to write the logical function in the form of a logical equation.
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| karnaugh table |
The logical function in the algebraic expression
As we mentioned, the Karnaugh table allows us to write the logical function in the form of equations called logic expressions, which turn allow us to draw a diagram of the electronic circuit.
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electronic diagram
Ultimately, before the stage of manufacturing electronic circuits, we draw a circuit diagram that consists of the basic circuits of digital electronics called logic gates. These are the smallest logical circuits with simple functions, from which we can create electronic circuits with complex functions.
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