This document provides information about analog to digital conversion and digital to analog conversion. It discusses different types of converters including flash ADCs, successive approximation ADCs, dual slope ADCs, R-2R ladder DACs, and weighted resistor DACs. It also covers analog and digital signals, the conversion processes, and applications of ADCs and DACs in areas like data acquisition and fiber optic communication.
Simple description about the analog and digital signals
and a description about analog to digital conversion &
digital to analog conversion..............
The content is related to Analog electronics. The prEsentation contains ADC process, Sampling and holding, Quantizing and encoding, Flash ADC, Pipeline ADC etc.
Simple description about the analog and digital signals
and a description about analog to digital conversion &
digital to analog conversion..............
The content is related to Analog electronics. The prEsentation contains ADC process, Sampling and holding, Quantizing and encoding, Flash ADC, Pipeline ADC etc.
Salient Features:
The magnitude response is nearly constant(equal to 1) at lower frequencies
There are no ripples in passband and stop band
The maximum gain occurs at Ω=0 and it is H(Ω)=1
The magnitude response is monotonically decreasing
As the order of the filter ‘N’ increases, the response of the filter is more close to the ideal response
This is one of a type of Analog to Digital Converter (ADC).
Through this presentation, you will have a clear view of how an ADC works. This one specifies one of the types of Analog to Digital Convertor.
This presentation contains the basic information you need to know about operational amplifier.
I have tried to cover all the basic info. If anything is left out or you have any suggestions i will appreciate it.
It is a digital representation of an analog signal that takes samples of the amplitude of the analog signal at regular intervals. The sampled analog data is changed to, and then represented by, binary data.
ADC stands for analog to digital converter,it is use to convert analog signal to digital.In Embedded system this is very important because various device give analog input but micro-controller is process only digital input.
Salient Features:
The magnitude response is nearly constant(equal to 1) at lower frequencies
There are no ripples in passband and stop band
The maximum gain occurs at Ω=0 and it is H(Ω)=1
The magnitude response is monotonically decreasing
As the order of the filter ‘N’ increases, the response of the filter is more close to the ideal response
This is one of a type of Analog to Digital Converter (ADC).
Through this presentation, you will have a clear view of how an ADC works. This one specifies one of the types of Analog to Digital Convertor.
This presentation contains the basic information you need to know about operational amplifier.
I have tried to cover all the basic info. If anything is left out or you have any suggestions i will appreciate it.
It is a digital representation of an analog signal that takes samples of the amplitude of the analog signal at regular intervals. The sampled analog data is changed to, and then represented by, binary data.
ADC stands for analog to digital converter,it is use to convert analog signal to digital.In Embedded system this is very important because various device give analog input but micro-controller is process only digital input.
Differential Boundary-Layer Analysis and Runback Water Flow Model Applied to ...ATS4i
The present work implemented heat transfer sub-models into an anti-ice
model to:
1) estimate the airfoil surface wetness factor by adopting a liquid water
film flow model as well as a rivulet formation and flow model;
2) evaluate laminar and turbulent boundary layers with pressure gradient
and laminar-turbulent transition over non-isothermal and permeable
airfoil surfaces by implementing differential boundary layer analysis
and
3) predict the onset position and length of the laminar-turbulent transition
region.
Inform- interacting with a dynamic shape displayHari Teja Joshi
ABSTRACT
Past research on shape displays has primarily focused on rendering content and user interface elements through shape output, with less emphasis on dynamically changing UIs. We propose utilizing shape displays in three different ways to mediate interaction: to facilitate by providing dynamic physical affordances through shape change, to restrict by guiding users with dynamic physical constraints, and to manipulate by actuating physical objects. We outline potential interaction techniques and introduce Dynamic Physical Affordances and Constraints with our inFORM system, built on top of a state-of-the-art shape display, which provides for variable stiffness rendering and real-time user input through direct touch and tangible interaction. A set of motivating examples demonstrates how dynamic affordances, constraints and object actuation can create novel interaction possibilities.
Description of the analog to digital convercion process (ADC).
It is becoming more and more widespread to imply progressive technologies into different aspect of both daily and business life. One of the most desired technology that is being implicated into numerous industries is speech–recognition software. In reality, it looks like an operator speaks to his computer/machine/device and sets commands which are performed subsequently. Special voice-recognition software ADC (Analog-to-digital converter) lies in the heart of this process. Its main role is to transform human speech to “computer” speech which set commands. To understand the principle of voice command working, we concentrate on the technology of ADC.
ROLE OF C & I IN FERTILIZER PRODUCTION PLANTGaurav Rai
Role of control and instrumentation in fertilizer production plant.
use of different instruments in measurement of pressure, flow and temperature in fertilizer plant.
The discrete Fourier transform has many applications in science and engineering. For example, it is often used in digital signal processing applications such as voice recognition and image processing.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
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Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
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Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
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3. Contents
1)Introduction to Analog and digital signals
2)Process of conversion of A to D & D to A signals
3)Types of D to A convertors
4)Types of A to D convertors
5)Applications of ADC & DAC
4. Analog Signals: Analog signals are the signals which may have
infinite number of different magnitudes or values. They vary
continously with time. Sine wave, triangluar wave etc. are the few
examples of analog signals.
Digital signals: A signal is known as a digital signal if it has only a
finite number of predominated distint magnitudes. Depending upon
the number of distinct magnitudes , the digital signals may have
classified as under:
S.NO NO. of distinct magnitudes Types of digital signal
1 2 Binary
2 8 Octal
3 16 hexadecimal
5. Real world (lab) is
analog
V
t t
Computer (binary) is
digital
D/A Conversion Computer DAC
Computer DAC
A/D Conversion
V
6. Digital to Analog Conversion (DAC or
D/A)
8 bits
Computer
A/D
Digital to Analog conversion involves transforming the computer’s
binary output in 0’s and 1’s (1’s typically = 5.0 volts) into an analog
representation of the binary data
7. 4 - bit DAC Converter
Resistor values correspond to
binary weights of the number D3
D2 D1 D0 , i.e. 1/8, 1/4, 1/2,
and 1
Difficulties:
1. This setup requires a wide range of precision resistors and (SPDT) switches
A 10 bit DAC needs resistors ranging from R to R/1024.
2. The circuit driving the DAC (usually a computer) must supply a wide range of currents for a
constant Vout
Important points for a 8-bit weighted DAC
1it is possible to connect the op-amp in the non-inverting summing amplifier configuration
instead of using the inverting configuration.
2 In this circuit op amp operates as a voltage to current convertor.
8. R-2R LADDER DACR-2R LADDER DAC
* The problem of using the wide range of resistor values can be solved by using the R-2R ladder
type DAC.
* It shows that only two values of resistors are required. This method is therefore suitable for
integrated circuit realization.
* We can increase the number of bits just by adding more sections of same R-2R values.
* Due to the small resistance spread (only 1 to 2) , the R-2R ladder can be fabricated
monolithically , with a high accuracy and stability .
10. An 8-bit converter can represent a voltage to within one part in 256, or
about 0.25 %. This corresponds to an inherent uncertainty of ± ½ LSB
(least significant bit).
Decimal 128 = 0 1 1 1 1 1 1 1
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
Bit
6
Bit
7
Bit
0
LSBMS
B
Notice the bits are designated B7 - B0. Bit B7 is the Most Significant
Bit while B0 is the Least Significant Bit
Some important points on ADC
An ideal A/D converter takes an input analog voltage and converts it to a
perfectly linear digital representation of the analog signal
If you are using an 8-bit converter, the binary representation is 8-bit binary
number which can take on 28
or 256 different values. If your voltage range
were 0 - 5 volts, then
0 VOLTS 0000 0000
5 VOLTS 1111 1111
11. Types of Analog to Digital
Converters
1. Counter Type
2. Integrating or Dual Slope
3. Parallel or Flash
4. Successive Approximation
12. Counter Type
Control Logic
D A C
Counter
START
Vin
Comparator
Digital Output
clock
•When START is received,
•control logic initializes the system, (sets counter to 0), and
•turns on Clock sending regular pulses to the counter.
As the Clock sends regular pulses to the counter, the counter outputs a digital signal to
the Digital-to-Analog converter
13. Control Logic
D A C
Counter
START
Vin
Comparator
Digital Output
clock
As the counter counts, its output to the D A C generates a staircase
waveform ramp also increases to the comparator.
As the ramp voltage increases to the comparator, it rises closer
and closer to Vin at which point the comparator shifts states
14. When the ramp voltage exceeds Vin , the comparator output shifts
which signals the control logic to turn off the clock
Vin
Conversion time
V’in
Conv.time
With the clock off, the counter
reading is proportional to Vin
Note that the conversion
time depends on the size
of the input signal
Vin
Comparator
15. Track & Hold Logic
D A C
Up/Down
Counter
Vin
Comparator
Digital Output
clock
Tracking ADC - similar to the counter type except it uses an
up/down counter and can track a varying signal more quickly
16. Vin
-Vref
Control logic
Counter
clock
comparator
integrator
Digital Output
As conversion is initiated, the control logic enables the clock which then sends
pulses to the counter until the counter fills (9999)
When conversion is initialized, the switch is connected to Vin which is applied to the
op amp integrator. The integrator output (>0) is applied to the comparator.
Integrating or Dual Slope A/D
18. The negative reference voltage removes the charge
stored in the integrator until the charge becomes zero.
The total number of counts on the counter (determined by
the time it took the fixed voltage Vref to cancel Vin ) is
proportional to the input voltage, and thus is a measure of
the unknown input voltage.
At this point, the comparator switches states producing a
signal that disables the clock and freezes the counter
reading.
19. fixed time
measured time
IntegratorOutputVoltage
full scale conversion
quarter scale conversion
half scale conversion
The operation of this A/D requires 2 voltage slopes,
hence the common name DUAL-SLOPE.
charging up
the capacitor discharging
the capacitor
20. If very high speed conversions are needed, e.g. video conversions, the most
commonly used converter is a Flash Converter.
While such converters are extremely fast, they are also very costly compared to other
types.
Flash Converters
21. IMPORTANT POINTS ON FLASH ADC
The resistor network is a precision voltage divider, dividing Vref (8 volts in the
sample) into equal voltage increments (1.0 volts here) to one input of the
comparator. The other comparator input is the input voltage
Each comparator switches immediately when Vin exceeds Vref . Comparators
whose input does not exceed Vref do not switch.
A decoder circuit (a 74148 8-to-3 priority decoder here) converts the comparator
outputs to a useful output (here binary)
The speed of the converter is limited only by the speeds of the comparators and the
logic network. Speeds in excess of 20 to 30 MHz are common, and speeds > 100
MHz are available.
DISADVANTAGE
1)The biggest disadvantage of this type of ADC is that a large number of comparators
are required to be used.
2)For 2 bit: 3 comparators, for 3 bit: 7 comparators ; for 4 bit 15 comparators.
26. Successive approximation search tree
for a 4-bit A/D
1111
1110
1101
1100
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
D/A output
compared with
Vin to see if
larger or smaller
Note that the successive approximation
process takes a fixed time - 8 clock cycles
for the 8-bit example.
For greater accuracy, one must use a
higher bit converter, i.e. 10-bit, 12-bit, etc.
However, the depth of the search and the
time required increases with the bit count.
27. S.No Parameters Flash type ADC Successive
approximation
type ADC
Dual slope type
ADC
1 CONVERSION TIME Shortest Moderately long Longest
2 SPEED Fastest Faster than dual
slope
Slowest
3 ACCURACY OF
CONVERSION
Less accurate Moderately
accurate
Very accurate
4 COST Very costly Moderately high Low
5 ADVANTAGES High speed and no
input hold time
Constant
conversion of time,
good speed
High accuracy ,
low cost
6 DISADVANTAGES Low accuracy, high
cost
Not many Long conversion
time, low speed
7 APPLICATIONS All high speed
applications such as
CRO, fibre optic
communication
All data
acquisition
systems
All those
applications which
need very high
accuracy