Analogue electronics

All you want to know about Analogue electronics

Analog electronics (or analogue in British English) are those electronic systems with a continuously variable signal. In contrast, in digital electronics signals usually take only two different levels. The term "analog" describes the proportional relationship between a signal and a voltage or current that represented the signal.

Contents

Analog signals

Main article: Analog signal

An analog signal uses some attribute of the medium to convey the signal's information. For example, an aneroid barometer uses angular position as the signal to convey pressure information. Electrical signals may represent information by changing their voltage, current, frequency, or total charge. Information is converted from some other physical form ( such as sound, light, temperature, pressure, position) to an electrical signal by a transducer.

The signals take any value from a given range, and each unique signal value represents different information. Any change in the signal is meaningful, and each level of the signal represents a different level of the phenomenon that it represents. For example, suppose the signal is being used to represent temperature, with one volt representing one degree Celsius. In such a system 10 volts would represent 10 degrees, and 10.1 volts would represent 10.1 degrees.

Another method of conveying an analog signal is to use modulation. In this, some base carrier signal has one of its properties altered: amplitude modulation (AM) involves altering the amplitude of a sinusoidal voltage waveform by the source information, frequency modulation (FM) changes the frequency. Other techniques, such as changing the phase of the carrier signal are also used.

In an analog sound recording, the variation in pressure of a sound striking a microphone creates a corresponding variation in the current passing through it or voltage across it. An increase in the volume of the sound causes the fluctuation of the current or voltage to increase proportionally while keeping the same waveform or shape.

Mechanical, pneumatic, hydraulic and other systems may also use analog signals.

Inherent noise

Analogue systems invariably include noise; that is, random disturbances or variations, some caused by the random thermal vibrations of atomic particles. Since all variations of an analogue signal are significant, any disturbance is equivalent to a change in the original signal and so appears as noise. As the signal is copied and re-copied, or transmitted over long distances, these random variations become more significant and lead to signal degradation. Other sources of noise may come from external electrical signals, or poorly designed components. These disturbances are reduced by shielding, and using low noise amplifiers.

Analog vs. digital electronics

Since the information is encoded differently in analog and digital electronics, the way they process a signal is consequently different. All operations that can be performed on an analog signal such as amplification, filtering, limiting, and others, can also be duplicated in the digital domain.

The first electronic devices invented and mass produced were analogue. The use of microelectronics has reduced the cost of digital techniques and now make digital methods feasible and cost-effective.

The main differences between analog and digital electronics are listed below:

Noise

Because of the way information is encoded in analog circuits, they are much more susceptible to noise than digital circuits, since a small change in the signal can represent a significant change in the information present in the signal and can cause the information present to be lost. Since digital signals take on one of only two different values, a disturbance would have to be about one-half the magnitude of the digital signal to cause an error; this property of digital circuits can be exploited to make signal processing noise-resistant. In digital electronics, because the information is quantized, as long as the signal stays inside a range of values, it represents the same information. Digital circuits use this principle to regenerate the signal at each logic gate, lessening or removing noise.

Precision

A number of factors affect how precise a signal is, mainly the noise present in the original signal and the noise added by processing. See signal-to-noise ratio. Fundamental physical limits such as the shot noise in components limits the resolution of analogue signals. In digital electronics additional precision is obtained by using additional digits to represent the signal; the practical limit in the number of digits is determined by the performance of the analogue to digital converters, since digital operations can usually be performed without loss of precision.

Design difficulty

Digital systems are much easier and smaller to design than comparable analogue circuits. This is one of the main reasons why digital systems are more common than analog. An analogue circuit must be designed by hand, and the process is much less automated than for digital systems. Also, because the smaller the integrated circuit (chip) the cheaper it is, and digital systems are much smaller than analog, therefore a digital system is cheaper to manufacture than an analog one, generally.

Growing irrelevance of the comparison

In newer digital systems, data is actually encoded using the basis of analogue signals. The reason being, that under ever competitive requirements to increase the areal densities of digital signals, inter-transition and intersymbol interference(ISI) of high frequency signals makes it no longer viable to encode digital information using digital signals.

The evolution from a digital basis towards an analogue basis of encoding digital information is exemplified by magnetic storage (hard-disks) and telephony (wireless, cell-phones).

Therefore, recent advances attained in high density/frequency digital systems are actually due to advances in analogue signal processing techniques and digital interpretation technologies. The evolution from employing discrete clocked signals towards use of PRML and EPRML encoding of magnetic storage information reflects the relevance of the debate.[1][2]

In analogue encoding like (E)PRML, noise compensation is actually achieved through complex analogue/digital circuitry, which would reflect on the accuracy of the statement that digital encoding helps mitigate noise factors in analogue information.

Rather than comparing advantages, technological advances require architectural integration of digital and analogue information.

The relevance or irrelevance of the debate of Analogue vs Digital systems should be comprehended with the fact that a modern "digital" system is actually both an analogue as well as a digital system.


See also

References

  1. ^ "Introduction to PRML".
  2. ^ "Hard Disk Data Encoding and Decoding".
 This article does not cite any references or sources.
Please help improve this article by adding citations to reliable sources. Unverifiable material may be challenged and removed. (January 2007)
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