Differences between Analog and Digital Circuits
In this post you’ll know what’s the difference between Analog and Digital Circuits.
1-Analog Circuits :
As mentioned earlier, an Analog Circuit is a type of Electronic Circuit which processes analog data using analog components like resistors, capacitors, diodes, transistors etc.
Analog Circuits can be quite simple like a combination of resistors to form a voltage divider or a combination of Op-amps (which internally contain transistors), resistors, diodes etc. to form an amplifier.
The following is an example of a simple Analog Circuit.
This is a simple amplifier circuit implemented using Op-amp, resistors and capacitors. By selecting appropriate values for resistors and capacitors, you can achieve a significant gain at the output.
Old-school Cathode Ray Oscilloscope (CRO) is an Analog Device that can detect ad analyse analog signals .
2- Digital Circuits :
On the contrary, a Digital Circuit is also a type of an electronic circuit that is predominantly built using Digital electronic components to process digital signals. At low level, the digital circuits consist of a combination of transistors, logic gates (AND, NAND, NOT etc.) and at high level, microcontrollers and processors.
All Digital circuits work on the binary digital signalling i.e. using only two voltage levels to represent the status signal i.e. ON or OFF. For performing various digital signal processing, all digital circuits incorporate fast switching devices like diodes and transistors and some of the important functions of digital circuits are multiplexing, demultiplexing, memory, combinational logic, sequential logic, etc.
The following is an example of a simple digital circuit built using CD4017 Counter IC.
This might not be clear but if you take a look at the internal structure of the CD4017 IC, you will see that it is essentially constructed using AND Gates, NOR Gates, Inverters, Flip-flops and buffers.
All the modern computers work in digital realm even though they are built using analog electronic components. Since most of the physical world is analog, the analog signals must be converted to digital signals before the computers can perform any operations.