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An analog or analogue signal is any time continuous signal where some time varying feature of the signal is a representation of some other time varying quantity.
It differs from a digital signal in that small fluctuations in the signal are meaningful.
Analog is usually thought of in an electrical context; however, mechanical, pneumatic, hydraulic, and other systems may also convey analog signals.
An analog signal uses some property of the medium to convey the signal's information.
For example, an aneroid barometer uses rotary position as the signal to convey pressure information.
Electrically, the property most commonly used is voltage followed closely by frequency, current, and charge.
Any information may be conveyed by an analog signal; often such a signal is a measured response to changes in physical phenomena, such as sound, light, temperature, position, or pressure, and is achieved using a transducer.
For example, in sound recording, fluctuations in air pressure (that is to say, sound) strike the diaphragm of a microphone which causes corresponding fluctuations in a voltage or the current in an electric circuit.
The voltage or the current is said to be an "analog" of the sound.
Any measured analog signal must theoretically have noise and a finite slew rate.
Therefore, both analog and digital systems are subject to limitations in resolution and bandwidth.
In practice, as analog systems become more complex, effects such as non-linearity and noise ultimately degrade analog resolution to such extent that the performance of digital systems may surpass it. In analog systems, it is difficult to detect when such degradation occurs.
However, in digital systems, degradation can not only be detected but corrected as well.
Source: Wikipedia (http://en.wikipedia.org/wiki/Analog_signal)
Here are the best overviews and tutorials for analog:
- tutorial, 4 stars
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Dr. R. David Middlebrook Analog Tutorial & Online Course
Two professors, Don Peter at Seattle Pacific U and Arthur Witulski, then at the U of Arizona Tucson, pressed me to conduct an Analog Workshop for instructors to consider the question 'Could, and Should, the D-OA approach be adopted in a first-level circuits course?' The outcome was unanimously positive, as was that of a second workshop conducted a year later.
Spearheaded by Marcelo Simoes, a professor at the Colorado School of Mines, Don...
- tutorial, 3 stars
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Basic Analog Circuits
This interactive tutorial introduces and explains the fundamentals of analog circuits.
It covers analog circuit concepts explaining Ohm’s law, capacitance calculations, inductance calculations, series and parallel configurations for capacitance and inductance and also RC filters.
- overview, 3 stars
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Wikipedia: Mixed-signal integrated circuit
A mixed-signal integrated circuit combines analog circuits with digital signal processing (DSP) circuits on a single semiconductor die. An integrated circuit that includes both analog and digital circuitry (but no DSP), like a 555 timer, is generally not considered a mixed-signal integrated circuit.
Typically, mixed-signal chips perform some whole function or sub-function in a larger assembly such as the radio subsystem of a cell phone,...
To browse all sites for 'ANALOG,' click
here
.
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