An analog system contains devices that manipulated the physical quantities represented in analog form. in an analog system,the quantities can vary continuously over a range of values.For example,the amplitude of output signal to the speaker in a radio receiver can have any value between zero and its maximum limit.other common analog systems are the magnetic tape recording and playback equipment,automobile speedometer and the telephone system.
A digital system is a combination of device designed for manipulating physical quantities or information represented in digital form,i.e.,they can take only discrete values. Such devices are mostly electronic,but they can also be mechanical ,magnetic or pneumatic.some of the familiar digital systems are calculators,digital watches,digital computers,traffic-signal controller,typewriters etc.
Merits and Limitation of Digital Techniques
Merits.
2.Storage of information is easier as it is accomplished by special switching circuits that can latch into information and hold it for as long as required.
3.Greater accuracy and precision as digital systems can handle as many digits of precision as needed simply by adding more switching circuits.In analog systems precision is usually limited to three or four digits because the values of voltage and current directly depend on the values of circuit components.
4.Programmable operation as the digital systems can be easily designed for operations controllable by a set of stored instruction called a program.
Analog system can also be programmed,but the variety and complexity of the available operation is severely limited.
5.Digital circuits are less affected by noise as spurious fluctuations in voltage (noise) are not as critical in digital systems because the exact value of voltage is not important,as long as the noise is not large enough to prevent distinguishing a HIGH from a LOW.
A digital system is a combination of device designed for manipulating physical quantities or information represented in digital form,i.e.,they can take only discrete values. Such devices are mostly electronic,but they can also be mechanical ,magnetic or pneumatic.some of the familiar digital systems are calculators,digital watches,digital computers,traffic-signal controller,typewriters etc.
Merits and Limitation of Digital Techniques
Merits.
Location
1.Digital systems are easier to design as the circuits employed are switching circuits,where exact values of voltage or current are not important,only the range(HIGH or LOW),in which they fall,is important.2.Storage of information is easier as it is accomplished by special switching circuits that can latch into information and hold it for as long as required.
3.Greater accuracy and precision as digital systems can handle as many digits of precision as needed simply by adding more switching circuits.In analog systems precision is usually limited to three or four digits because the values of voltage and current directly depend on the values of circuit components.
4.Programmable operation as the digital systems can be easily designed for operations controllable by a set of stored instruction called a program.
Analog system can also be programmed,but the variety and complexity of the available operation is severely limited.
5.Digital circuits are less affected by noise as spurious fluctuations in voltage (noise) are not as critical in digital systems because the exact value of voltage is not important,as long as the noise is not large enough to prevent distinguishing a HIGH from a LOW.
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