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A particular device may consist of circuitry that has one or the other or a mix of the two types. Analog circuits Most analog electronic appliances, such as radio re- Electronics Technician performing a voltage check on a power circuit card in the air navigation equipment room aboard the aircraft carrier USS Abraham Lincoln CVN Components are generally intended to be connected together, usually by being soldered to a printed circuit board PCB , to create an electronic circuit with a particular function for example an amplier, radio receiver, or oscillator.
Components may be packaged singly, or in more complex groups as integrated circuits. Some common electronic components are capacitors, inductors, resistors, diodes, transistors, etc. Components are often categorized as active e.
Analog circuits use a continuous range liest electronic components. They were almost solely re- of voltage or current as opposed to discrete levels as in sponsible for the electronics revolution of the rst half of digital circuits.
They played anything from a single component, to systems containing a leading role in the eld of microwave and high power thousands of components.
Vacuum tubes are still though many non-linear eects are used in analog circuits used in some specialist applications such as high power such as mixers, modulators, etc. Good examples of anaRF ampliers, cathode ray tubes, specialist audio equip- log circuits include vacuum tube and transistor ampliers, operational ampliers and oscillators.
This to be manufactured for the commercial market. Thomas J. Watson Jr. From that time on transistors were almost exclusively used for computer logic and peripherals. Sometimes it may be dicult to dierentiate between analog and digital circuits as they have elements of both linear and non-linear operation. An example is the comparator which takes in a continuous range of voltage but 1. Similarly, an overdriven transistor amplier can take on the characteristics of a controlled switch having essentially two levels of output.
In fact, many digital circuits are actually implemented as variations of analog circuits similar to this exampleafter all, all aspects of the real physical world are essentially analog, so digital eects are only realized by constraining analog behavior. Digital circuits Main article: Digital electronics Digital circuits are electric circuits based on a number of discrete voltage levels.
Digital circuits are the most common physical representation of Boolean algebra, and are the basis of all digital computers. To most engineers, the terms digital circuit, digital system and logic are interchangeable in the context of digital circuits. Most digital circuits use a binary system with two voltage levels labeled 0 and 1.
Often logic 0 will be a lower voltage and referred to as Low while logic 1 is referred to as High. However, some systems use the reverse definition 0 is High or are current based. Quite often the logic designer may reverse these denitions from one circuit to the next as he sees t to facilitate his design. The denition of the levels as 0 or 1 is arbitrary. Ternary with three states logic has been studied, and some prototype computers made.
Techniques for heat dissipation can include heat sinks and fans for air cooling, and other forms of computer cooling such as water cooling. Main article: Electronic noise Electronic noise is dened as unwanted disturbances superposed on a useful signal that tend to obscure its information content.
Noise is not the same as signal distortion caused by a circuit. Noise is associated with all electronic circuits. Noise may be electromagnetically or thermally generated, which can be decreased by lowering the operating temperature of the circuit. Other types of noise, such as shot noise cannot be removed as they are due to limitations in physical properties. Computers, electronic clocks, and programmable logic 1. Digital signal processors are Main article: Mathematical methods in electronics another example.
An Introduction to Electronics
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