Digital to analogue conversion (dac), Basic Computer Science

Digital to analogue conversion (dac):

Since many systems used on aircraft will require outputs in analogue form, it will be necessary to be able to convert the digital information back into analogue. 

The input to the DAC is effectively a number, usually binary coded.  This number must be converted to a corresponding number of units of voltage (or current) by the DAC. 

The output of the DAC will thus be stepped as the digital input changes, taking on a series of discrete values.  The spacing between these values (quantisation levels) will depend on the length of the input digital word and the maximum range of the output voltage.  For example, a DAC, which can provide an output voltage of between 0 and 16 volts, will, with 4-bit word input, have 1 volt between quantisation levels and is illustrated in Figure. 

1056_digital to analog.png

 

Similarly, an output voltage range of 0 to 10 volts with 10-bit word input will give spacing between quantisation levels of approximately 0.01 volts.  The stepped nature of the output can of course be smoothed. 

To change a digital word into an analogue signal we require a circuit capable of carrying out this function.  One method would be to apply the digital word to a corresponding number of resistors (4-bit word - 4 resistors), connected as a potential divider.  Figure 9 shows a circuit that would carry out the function of Digital to Analogue conversion.

2000_digital to analog1.png

Posted Date: 9/13/2012 8:12:43 AM | Location : United States







Related Discussions:- Digital to analogue conversion (dac), Assignment Help, Ask Question on Digital to analogue conversion (dac), Get Answer, Expert's Help, Digital to analogue conversion (dac) Discussions

Write discussion on Digital to analogue conversion (dac)
Your posts are moderated
Related Questions
how do you let kids learn on it

What is a Structure?

Manipulate the following Boolean expression in such a way so that it can be implemented using exclusive-OR and AND gates only. AB''CD'' + A ''BCD'' + AB''C''D + A''BC''D

Compare and contrast two qualitative analysis approaches. You must select two that are a true contast eg  CAQADS (say leximancer ) v discourse analysis or thematic analysis by hand

Search strategy-artificial intelligence: Soundness: You  can hear  in  some  application domains  -  i.e.  automated  theorem proving - that a search is "sound and complet

The easiest way to approach pipelining is to regard as the three stage fetch, decode and execute instruction execution cycle outlined earlier. There are times during each of these


Breadth First Search - artificial intelligence: Given a set of operators o1, ..., on in a breadth primary search, every time a new state s is reached, an action for every  oper

NUMBER SYSTEM:  We are familiar with decimal number system which uses ten distinct symbols from 0...9, and has base 10. In the decimal number system a number n 4 n 3 n 2 n 1

suggest 5 ways by which new products and services can be developed using management information system