Analogue to digital converter, Basic Computer Science

Analogue to digital converter:

In an ADC a range of input values must correspond to a unique digital word.  The type of code used depends on the system but here only binary coding will be considered. 

Consider an analogue signal, which can take on any value between 0 and 7 volts.  For any particular voltage there is a corresponding binary code word. For example, using 3-bit words, the voltage analogue value between 4 and 5 volts would be represented in binary code by the word 100, which would change to 101, when the analogue value passed through 5 volts. 

Figure shows digital representation of an analogue input signals.

14_analog to digital converter.png

The levels at which the code changes are known as quantisation levels, and the intervals between them as quantisation intervals.  In the example given in Figure 5.3.3, the quantisation levels are 0, 1, 2, 3, 4, 5, 6 and 7 volts, and the quantisation interval is 1 volt. 

Using a 3-bit word gives 23 = 8 different quantisation levels.  With a 4-bit word we would have 24 = 16 quantisation levels with 0.5 volt quantisation intervals giving improved resolution over the same range of input voltage. 

Thus the more bits available the greater the resolution for a given range of analogue signal input.  It can be seen from the above that an ADC using an n-bit word would have a resolution of one part in 2n.  

 

Posted Date: 9/13/2012 8:09:54 AM | Location : United States







Related Discussions:- Analogue to digital converter, Assignment Help, Ask Question on Analogue to digital converter, Get Answer, Expert's Help, Analogue to digital converter Discussions

Write discussion on Analogue to digital converter
Your posts are moderated
Related Questions
Development of Personnel Computer Operating System: The next important breakthrough in computer use occurred in 1982, with the introduction of the IBM personal computer. The I

Computers can be used for better and more efficient management and organisation of laboratories. A computer like the human brain receives information, stores and processes it and t

Acting Rationally: Al Capone was finally convicted for tax evasion. Were the police acting rationally? To answer this, we must first look at how the performance of police force

This is a C file. 1. The program starts by printing your name with an end sign ">". For example, "NAME >"; 2. Then, you can type in a string. If the string is not "vi xxx", you pri

2. Mike sells on the average 15 newspapers per week (Monday – Friday). Find the probability that 2.1 In a given week he will sell all the newspapers [7] 2.2 In a given day he w

Question 1 Write down the Booth's Multiplication Algorithm. Justify the Booth's Multiplication Algorithm Question 2 Explain the functions of ALU Question 3 Define the term ins

Machines which exhibit intelligent nature Machines in this case could easily be personal computers, or they could be robots with embedded systems, or a combination of both. Wh

what protocol is used by DNS name server

Question 1 Explain Wireless Protocol Requirements and also explain in brief medium access control protocol Question 2 Explain FDMA and TDMA concepts Question 3 Exp