M5.3

Question 1

Data conversion: What type of data do many cockpit instruments display

Answer 1

Analogue and digital

Question 2

Data conversion: How many digital data levels are there

Answer 2

2 (binary)

Question 3

Data conversion: What can we do with digital signals

Answer 3

• Store values in computers
• Manipulate signals from a computer
• Compute new signals
• Remove or reduce noise from signals

Question 4

Data Conversions: What is a ADC

Answer 4

Analogue to digital converter

Question 5

Data conversion: What does a ADC do

Answer 5

Converts analogue to digital data

Question 6

Data conversion: How does a ADC convert data types

Answer 6

By periodically sampling and quantising the input signal over a short period of time

Question 7

Data conversion: What is a quantification level

Answer 7

Binary steps a ADC uses to produce a digital signal

Question 8

Data conversion: What is resolution

Answer 8

The number of quantisation levels or bands a ADC/DAC can produce

Question 9

Data conversion: A 8 bit DAC is able to produce how manny voltage levels

Answer 9

256different voltages

Question 10

Data conversion: What determines the resolution of a ADC or DAC

Answer 10

The number of binary bits in the digital output (or input)

Question 11

Data conversion: What is the fastest type of ADC

Answer 11

Direct Comparison converter

Question 12

Data conversion: What is the disadvantage of a direct comparison circuit

Answer 12

The circuit becomes large for output larger than 3 or 4 bits

Question 13

Data conversion: On a ramp generation converter, if the unknown input is greater than the ramp signal, what occurs

Answer 13

The counter continues

Question 14

Data conversion: When do ramp generation A/D work best

Answer 14

Where the analogue signal level varies at a slow rate (temperature sensor)

Question 15

Data Conversion: Advantage of a up-down counter

Answer 15

Eliminates the need for the clear line and the AND gate

Question 16

Data conversion: What is used to control the D/A ladder network in a successive approximation A/D

Answer 16

A programmer

Question 17

Data conversion: What does a comparator do

Answer 17

Used to indicate wether the D/A input is greater or less than the unknown input level

Question 18

Data conversion: What is the advantage of the successive approximation method

Answer 18

Much faster than the counting type methods

Question 19

Data conversion: What does DAC stand for

Answer 19

Digital to analogue converter

Question 20

Data conversion: What does a DAC converter do

Answer 20

A device that takes binary number or combinations of binary number and changes them into their corresponding voltages

Question 21

Data conversion: What is used to fill the gaps between the impulses creating a continuously varied output

Answer 21

A low pass reconstruction filter

Question 22

Data Conversion: What signal creates a DACs impulses

Answer 22

A clock timing signal

Question 23

Data conversion: What is the simplest D/A converter

Answer 23

Binary weighted Ladder DAC (Network)

Question 24

Data conversion: In a R-2R ladder what are the resistors in the ladder

Answer 24

R and 2R

Question 25

Data Conversion: Where are R-2R Ladder networks normally implemented

Answer 25

Solid State Devices

Question 26

Data conversion: What is noise

Answer 26

Degraded signals introducing errors when converting between A/D or D/A

Question 27

Data Conversion: What is a known limitation of multiple A/D and D/A conversions

Answer 27

Signal degradation