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Electronics
Electronics is the science and technology of electronic circuits[?] and devices such as thermionic valves and semiconductors using the physics of electricity.
This knowledge is applied in devices that manipulate electric currents and electromagnetic fields for the controlling or processing of information, or the conversion and distribution of electrical power.
While electricity had been used for some time to transmit data over telegraphs and telephones, the development of electronics truly began in earnest with the advent of radio.
Today, electronic devices perform a variety of tasks.
An electronic system can be divided into the following parts:
- Inputs - Electrical or mechanical sensors (or transducers), which take signals (in the form of temperature, pressure, etc.) from the physical world and convert them into current/voltage signals.
- Signal processing circuits - These consist of electronic components woven together to manipulate, interpret and transform the signals.
- Outputs - Actuators or other devices (also transducers) that transform current/voltage signals back into useful physical form.
Take as an example a television. Its input is a broadcast signal received by an antenna or fed in through a cable. Signal processing circuits inside the television extract the brightness, colour and sound information from this signal. The output device is a cathode ray tube that converts electronic signals into a visible image on a screen.
See also: transducer, microelectronics, optoelectronics, semiconductor, printed circuit board, wire wrap, point-to-point construction, integrated circuit, electrical engineering, computer engineering
Most analog electronic appliances, such as radio receivers, are constructed from arrays of a few types of circuits.
Computers, electronic clocks, and programmable logic controllers (used to control industrial processes) are constructed of digital circuits. Digital Signal Processors are another example.
Mixed-signal circuits[?], also known as hybrid circuits, are becoming increasingly common.
Mixed circuits contain both analog and digital components. analog to digital converters and digital to analog converters are the primary examples. Other examples are transmission gates[?] and buffers.
Associated with all electronic circuits is noise.
Types of noise include
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