Download presentation

Presentation is loading. Please wait.

Published byIsaiah Ryan Modified over 2 years ago

1
Analogue to Digital Conversion © D Hoult 2010 ODWSC

2
analogue signal © D Hoult 2010 ODWS

3
The analogue signal must be sampled (its voltage must be measured at regular intervals). © D Hoult 2010 ODWS

4
The analogue signal must be sampled (its voltage must be measured at regular intervals). To measure the voltage, the A to D converter produces its own voltage which it increases in discrete steps until it is equal to the signal voltage. © D Hoult 2010 ODWS

5
The analogue signal must be sampled (its voltage must be measured at regular intervals). To measure the voltage, the A to D converter produces its own voltage which it increases in discrete steps* until it is equal to the signal voltage. * this voltage is said to be quantised © D Hoult 2010 ODWS

6
The analogue signal must be sampled (its voltage must be measured at regular intervals). At this point the counter is disabled (it stops counting). To measure the voltage, the A to D converter produces its own voltage which it increases in discrete steps until it is equal to the signal voltage. © D Hoult 2010 ODWS

7
V s is the value of the signal voltage at the instant of sampling © D Hoult 2010 ODWS

8
The sampling process is assumed to take a very short time. © D Hoult 2010 ODWS

9

10

11
The precision of the process is limited by the size of the steps © D Hoult 2010 ODWS

12
This depends on the number of bits used by the counter © D Hoult 2010 ODWS

13
3 bit precision and sampling frequency 1 Hz © D Hoult 2010 ODWS

14
3 bit precision and sampling frequency 1 Hz © D Hoult 2010 ODWS

15
3 bit precision and sampling frequency 1 Hz © D Hoult 2010 ODWS

16
3 bit precision and sampling frequency 1 Hz © D Hoult 2010 ODWS

17
3 bit precision and sampling frequency 1 Hz © D Hoult 2010 ODWS

18
digital signal 3 bit precision and sampling frequency 1 Hz © D Hoult 2010 ODWS

19
digital signal binary coded output 3 bit precision and sampling frequency 1 Hz © D Hoult 2010 ODWS

20
digital signal binary coded output etc 3 bit precision and sampling frequency 1 Hz © D Hoult 2010 ODWS

21
3 bit precision and sampling frequency 2 Hz © D Hoult 2010 ODWS

22
3 bit precision and sampling frequency 2 Hz © D Hoult 2010 ODWS

23
3 bit precision and sampling frequency 2 Hz © D Hoult 2010 ODWS

24
digital signal binary coded output 3 bit precision and sampling frequency 2 Hz © D Hoult 2010 ODWS

25
digital signal binary coded output etc 3 bit precision and sampling frequency 2 Hz © D Hoult 2010 ODWS

26
3 bit precision and sampling frequency 4 Hz © D Hoult 2010 ODWS

27
digital signal binary coded output etc 3 bit precision and sampling frequency 4 Hz © D Hoult 2010 ODWS

28
4 bit precision and sampling frequency 4 Hz © D Hoult 2010 ODWS

29
4 bit precision and sampling frequency 4 Hz © D Hoult 2010 ODWS

30
binary coded output etc 4 bit precision and sampling frequency 4 Hz © D Hoult 2010 ODWS

31
4 bit precision and sampling frequency 8 Hz © D Hoult 2010 ODWS

32
binary coded output 4 bit precision and sampling frequency 8 Hz © D Hoult 2010 ODWS

33
etc 4 bit precision and sampling frequency 8 Hz © D Hoult 2010 ODWS

34
etc Binary coded digital output corresponding to the first four samples © D Hoult 2010 ODWS

35
etc Binary coded digital output corresponding to the first four samples © D Hoult 2010 ODWS

36
etc Binary coded digital output corresponding to the first four samples © D Hoult 2010 ODWS

37
etc Binary coded digital output corresponding to the first four samples © D Hoult 2010 ODWS

38
etc Binary coded digital output corresponding to the first four samples © D Hoult 2010 ODWS

39
etc Binary coded digital output corresponding to the first four samples In some systems, logic 1 (true) is represented by zero volts and logic zero (false) by 5 V © D Hoult 2010 ODWS

40
etc Binary coded digital output corresponding to the first four samples In some systems, logic 1 (true) is represented by zero volts and logic zero (false) by 5 V © D Hoult 2010 ODWS

Similar presentations

© 2016 SlidePlayer.com Inc.

All rights reserved.

Ads by Google