Digital Quantity
It
is quantity that has only discrete values. It is expressed in the digital form.
What is meant by analog quantity?
Analog Quantity
It is quantity which can take any value over a continuous range of values. E.g. temperatures, pressure, position, speed etc.
Write the full form of DAC and ADC.
DAC : Digital
to analog converter
ADC : Analog
to digital converter
Describe the function of A/D converter and D/A
converter
Function of A / D converter
The
function of the A / D converter is to convert analog quantity into digital
quantity.
Function of D / A
converter
The
function of the D / A converter is to convert digital code to a value.
How the analog to digital conversion is done?
Analog to digital conversion
Any physical quantity is first monitor by computer
and it is converted into electrical signal by transducer. This electrical
signal is converter into digital signals by using analog to digital converters.
How many numbers of possible inputs does the 4
– bit DAC consists of?
16 inputs
Explain the statement ‘The output of the DAC
is pseudo analog quantity.’
The output of the DAC
is not true analog quantity because it can take specific values. It is actually
digital therefore the output of the DAC is pseudo analog quantity.
What is full scale output of the 3 – bit DAC?
Full scale output of the DAC
The
maximum output of the DAC is called as full-scale output. The maximum output of
the 4 bit input is 15V.
Explain the term: Resolution, Linearity error
and Full scale error
Resolution
It
is defined as smallest change that occurs in the analog output due to change in
the digital input.
Linearity error
It
is defined as the maximum deviation of the analog output from the ideal output.
Full scale error
It
is defined as the maximum deviation of the digital to analog converter output
from its ideal value.
How the resolution of the DAC is expressed?
The resolution of the
DAC is expressed as the amount of current or voltage per step.
How many numbers of step size for the N – bit
DAC?
2N – 1
How the accuracy of the DAC is expressed?
The accuracy of the
DAC is expressed in terms of linearity error and full scale error.
Define : Settling time, Offset voltage
Settling time
It
is time delay between the binary data appears at the input and stable output is
obtained at the output.
Offset voltage
There
is small output voltage in spite of binary input is zero. It is called as
offset voltage.
In which term the operating speed of the DAC
is expressed?
The operating speed of
the DAC is expressed by its settling time.
What do you mean by monotonicity of the DAC?
Monotonicity
If
the output of the DAC is increases as the binary input is increased from one
value to the next value, it is called as Monotonicity.
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