Digital to analogue conversion (dac), Basic Computer Science

Assignment Help:

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


Related Discussions:- Digital to analogue conversion (dac)

Wcdma – fdd technology, WCDMA – FDD technology Multiple access technology i...

WCDMA – FDD technology Multiple access technology is wideband CDMA (WCDMA) All cells at same carrier frequency Spreading codes used to separate cells and users Signal bandwidth 3.8

Describe symbols chart in assembly process ?, SYMBOLS CHART Every one of t...

SYMBOLS CHART Every one of the parts on code line in assembler is known as token, for instance on the code line: MOV AX, Var We comprise three tokens, the MOV instruction, the AX o

Java programming, what are the phases of oo progarmming or java?

what are the phases of oo progarmming or java?

Spreadsheet to provide a business solution, Gareth's Gardens is a small fir...

Gareth's Gardens is a small firm that specialises in planning and laying new gardens.  A particularly popular garden plan consists of a patio and lawn, together with a circular pon

Assignment Help, How would you format while loops to fufill my project writ...

How would you format while loops to fufill my project write up?

Analogue computers, ANALOGUE COMPUTERS A computer is basically a proble...

ANALOGUE COMPUTERS A computer is basically a problem-solving device. In aircraft radio systems the problem to be solved is concerned with navigation, in that given certain inf

Surveying, describe the two fundament purpose of surveying

describe the two fundament purpose of surveying

Explain briefly about gnome desktop, Question 1 Brief about the shells of ...

Question 1 Brief about the shells of Linux operating system Question 2 Explain briefly about GNOME desktop Question 3 Write note on the following Encryption Sig

Special-purpose and general-purpose computers, SPECIAL-PURPOSE AND GENERAL-...

SPECIAL-PURPOSE AND GENERAL-PURPOSE COMPUTERS In general, there are two types of digital computers. The first is the special-purpose digital computer, which performs a f

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd