This document contains an agenda and summary of key concepts related to nonlinearity:
- Harmonic distortion results in the generation of harmonics that are integer multiples of the fundamental frequency. Higher order harmonics grow with increasing amplitude.
- Gain compression occurs when the output amplitude falls below the ideal linear value, reducing receiver sensitivity.
- Cross modulation transfers modulation from an interfering signal to the desired signal.
- Intermodulation products are generated when two or more signals pass through a nonlinear system, which can fall on the desired channel frequency.
- AM/PM conversion undesirably alters the phase of a signal based on its amplitude variations.
Sensitivity or selectivity - How does eLNA impact the receriver performancecriterion123
it describes
1. Why need external LNA ?
2. Why does poor linearity lead to poor sensitivity ?
3. For the eLNA gain, the more the better ?
4. Why can SAW filter improve linearity ?
Sensitivity or selectivity - How does eLNA impact the receriver performancecriterion123
it describes
1. Why need external LNA ?
2. Why does poor linearity lead to poor sensitivity ?
3. For the eLNA gain, the more the better ?
4. Why can SAW filter improve linearity ?
Location of front RF filter effect on Sensitivity and Spur-Free Dynamic range is examined with a simple hand calculation. Using simple numerical calculation to provide an insight.
System(board level) noise figure analysis and optimizationcriterion123
For sensitivity, what a system (board level) RF engineer can improve is only noise figure. This document describes that the noise figure concept you should know, and how to optimize it to improve sensitivity.
desence,sensitivity calculation with and without external LNA, Noise figure calculation with and without external LNA and IIP3 calculation with and without external LNA
Hello everyone. This is a short presentation on path loss and shadowing. I have not covered all the topics but a brief idea is given on path loss and wireless channel propagation models.
Hope you find it useful.
Thanks
Why to do single-tone desense test ?
What is cross modulation ?
what's the difference between cross modulation and intermodulation ?
what is triple beat ?
Location of front RF filter effect on Sensitivity and Spur-Free Dynamic range is examined with a simple hand calculation. Using simple numerical calculation to provide an insight.
System(board level) noise figure analysis and optimizationcriterion123
For sensitivity, what a system (board level) RF engineer can improve is only noise figure. This document describes that the noise figure concept you should know, and how to optimize it to improve sensitivity.
desence,sensitivity calculation with and without external LNA, Noise figure calculation with and without external LNA and IIP3 calculation with and without external LNA
Hello everyone. This is a short presentation on path loss and shadowing. I have not covered all the topics but a brief idea is given on path loss and wireless channel propagation models.
Hope you find it useful.
Thanks
Why to do single-tone desense test ?
What is cross modulation ?
what's the difference between cross modulation and intermodulation ?
what is triple beat ?
Fast fading, Slow fading and Multipath effect in wireless communicationsPei-Che Chang
Fast fading, Slow fading and multipath effect in wireless communications
QPSK in AWGN channel
QPSK in AWGN + Rayleigh fading channel
using GNU Octave simulation
Introduction to differential signal -For RF and EMC engineercriterion123
It describes :
1. What is the advantages of differential signal
2. What should you pay attention to differential signal
3. What should you pay attention to the bend of differential
signal
4. What should you pay attention to the EMI filter
5. What should you pay attention to ground plane
6. What should you pay attention to loop area
UPDATE 8 version 2.4 Final (December, 2015)
Winners of 1800MHz and 900 MHz bidding
Thailand’s National Broadcasting and Telecommunications Commission (NBTC) has finally been able to set a timetable for the country's 4G spectrum auctions, after the cabinet gave the green light to proceed with the auctions plans.
The NBTC expects to issue 4G licenses for the 1800 MHz spectrum and the 900 MHz spectrum.
UPDATE 7 version 2.2 (October, 2015)
MobileLTE may join the 900 MHz bidding
UPDATE 6 version 2.1 (September 22, 2015)
900 MHz auction timeline and minimum bidding price
UPDATE 5 Version 1.6 (June 24, 2015)
The telecom committee of NBTC approved adding a maximum spectrum cap of 60 MHz for each operator in Thailand on June 23, 2015. The cap applies to telecom frequencies including those either under concessions or the license system and covers frequencies ranging from 470 MHz - 2600 MHz
UPDATE 4 Version 1.5 (May 15 2015)
Agreement reached between CAT TELECOM and DTAC whereas 5 MHz unused bandwidth from DTAC could be added to the auction giving it a total of 30 MHz divided into two slots of 15 MHz. However the regulator has rejected that proposal.
UPDATE 3 Version 1.4 (24 April, 2015)
Most common frequencies used worldwide for 4G/LTE
International spectrum usage
LTE FDD and LTE TDD device support
Smartphone support example
UPDATE 2: April 22, 2015. Version 1.3: MCOT has agreed to return its unused 60 MHz of bandwidth out of 144 MHz on the 2600 MHz spectrum. The state-run broadcaster will receive THB 100 million in compensation.
UPDATED April 16, 2015 Version 1.2
I use this presentation for opening 4G Mobile Technology seminar sessions. Usually it will be continued with 1 other presentation on LTE, 1 on WiMAX II, and 1 on applications.
Introduction
Band Pass Amplifiers
Series & Parallel Resonant Circuits & their Bandwidth
Analysis of Single Tuned Amplifiers
Analysis of Double Tuned Amplifiers
Primary & Secondary Tuned Amplifiers with BJT & FET
Merits and de-merits of Tuned Amplifiers
Design of a Low Noise Amplifier using 0.18μm CMOS technologytheijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Electronics and Communication Engineering is the Branch of Engineering. Electronics and Communication Engineering field requires an understanding of core areas including Engineering Graphics, Computer Programming,Electronics Devices and Circuits-I, Network Analysis, Signals and Systems, Communication Systems, Electromagnetics Engineering, Digital Signal Processing, Embedded Systems, Microprocessor and Computer Architecture. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus. Visit : https://ekeeda.com/streamdetails/stream/Electronics-and-Communication-Engineering
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OPERATIONAL AMPLIFIERS, DIFFERENTIAL, NON-INVERTING AND INSTRUMENTATIONAL AMP...Kramikauniyal
THEORY AND EXPLANATION OF OPERATIONAL AMPLIFIER AND ITS APPLICATION IN FORMING NON-INVERTING AMPLIFIERS, DIFFERENTIAL AMPLIFIERS, INSTRUMENTATIONAL AMPIFIERS ALONG WITH FEW SOLVED NUMERICAL PROBLEMS FOR BETTER UNDERSTANDING, THE CONTENT IS PRECISE AND SUFFICIENT TO UNDERSTAND THE THEORY RELATED TO THE TOPICS
Distributed Architecture of Subspace Clustering and RelatedPei-Che Chang
Distributed Architecture of Subspace Clustering and Related
Sparse Subspace Clustering
Low-Rank Representation
Least Squares Regression
Multiview Subspace Clustering
Probabilistic Matrix Factorization (PMF)
Bayesian Probabilistic Matrix Factorization (BPMF) using
Markov Chain Monte Carlo (MCMC)
BPMF using MCMC – Overall Model
BPMF using MCMC – Gibbs Sampling
Deterministic MIMO Channel Capacity
• CSI is Known to the Transmitter Side
• CSI is Not Available at the Transmitter Side
Channel Capacity of Random MIMO Channels
Cosmetic shop management system project report.pdfKamal Acharya
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.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
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/
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
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Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
4. Even-order harmonics result from αj with even j.
nth harmonic grows in proportion to An.
DC Fundamental Second
Harmonic
Third
Harmonic
Effects of Nonlinearity: Harmonic Distortion
Harmonic Distortion
2 3
1 2 3( ) ( ) ( ) ( ).
where ( ) cos .
y t x t x t x t
x t A t
2 3
0 1 2 3( ) ( ) ( ) ( )y t x t x t x t
If only α0 ≠ 0, rectifier convert AC input to DC.
If only α1 ≠ 0, linear attenuator (α1 < 1) and linear amplifier (α1 > 1).
If only α2 ≠ 0, mixer.
And in most PA α3 < 0.
x(t) y(t)
5. Example of Harmonic Distortion in Mixer
Solution:
An analog multiplier “mixes” its two inputs below, ideally producing y(t) = kx1(t)x2(t), where k
is a constant. Assume x1(t) = A1 cos ω1t and x2(t) = A2 cos ω2t.
(a) If the mixer is ideal, determine the output frequency components.
(b) If the input port sensing x2(t) suffers from third-order nonlinearity, determine the output
frequency components.
(a)
(b)
Ex: B5, B8 and B9 fighting
if ω1 = 2π x (850 MHz) and ω2 = 2π x (900 MHz),
then |ω1 - 3ω2| = 2π x (1850 MHz), an “undesired” component that
is difficult to filter because it lies close to the desired component at
ω1 + ω2 = 2π x (1750 MHz).
7. Effects of Nonlinearity: Gain Compression
Gain Compression
Expansive Compressive
Most RF circuit of interest are compressive, we focus on this type.
Output falls below its ideal value by 1 dB at the 1-dB compression point.
Peak value instead of peak-to-peak value.
P1dB is typically in the range of -20 to -25 dBm (63.2 to 35.6 mVpp in 50 Ohm system)
at the input of RF receivers.
3
1 3
2
1 3
3
cos
34
gain compression.
cos 4
v
A A t
G A
A t
8. Gain Compression: Effect on FM and AM Waveforms
FM signal carries no information in its amplitude and hence tolerates compression
(i.e., amplitude limiting).
AM contain information in the amplitude, hence distorted by compression.
9. Desensitization: the receiver gain is reduced by the large excursions produced by the interferer
even though the desired signal itself is small.
Rx must be able to withstand blockers that are 60 to 70 dB greater than the desired signal.
For A1 << A2
Gain Compression: Desensitization
2 3
1 2 3
1 1 2 2
( ) ( ) ( ) ( ).
where ( ) cos cos .
y t x t x t x t
x t A t A t
2
1 3 1 2 1 3 2
3
if 0, when the gain drop to zero.
2
A A A = In math
11. Effects of Nonlinearity: Cross Modulation
Cross Modulation
Desired signal at output suffers from amplitude modulation at ωm and 2ωm.
Suppose that the interferer is an amplitude-modulated signal
Thus
when a weak signal and a strong interferer pass through
a nonlinear system is the transfer of modulation from the interferer to the signal.
2 21 cos cosmA m t t
12. Effects of Nonlinearity: Cross Modulation
Wanted signal(fRX) corruption due to the cross-modulation of an amplitude-modulated blocker with a CW
jammer close to the RX channel.
Wanted signal(fRX) corruption due to the intermodulation of an amplitude-modulated blocker (the aggressor
TX) with a CW jammer.
15. Harmonic distortion
Desensitization
Intermodulation
So far we have considered the case of:
Single Signal
Signal + one large interferer
Signal + two large interferers
Effects of Nonlinearity: Intermodulation-
Recall Previous Discussion
16. Effects of Nonlinearity: Intermodulation
Intermodulation
assume
Thus
Intermodulation products:
Fundamental components:
17. Intermodulation Product Falling on Desired Channel
desired
Interferer
A received small desired signal along with two large interferers.
Intermodulation product falls onto the desired channel, corrupts signal.
18. IP3 is not a directly measureable quantity, but a point obtained by extrapolation.
Intermodulation: Third Intercept Point
19. PA: power range that is limited at the low end by
noise and at the high end by the compression
point. This is essentially the linear operating range
for the amplifier, and is called the linear dynamic
range (DRl).
LNA or mixer: operation may be limited by noise
at the low end and the maximum power level for
which intermodulation distortion becomes
unacceptable. This is effectively the operating
range for which spurious responses are minimal,
and is called the spurious-free dynamic range (DRf).
Intermodulation: Dynamic Range
20. Effects of Nonlinearity: Cascaded Nonlinear Stages
Considering only the first- and third-order terms, we have:
Thus,
21. To “refer” the IP3 of the second stage to the input of the cascade, we must divide it by α1.
Thus, the higher the gain of the first stage, the more nonlinearity is contributed by the second
stage.
Cascaded Nonlinear Stages: Intuitive results
1 3total IP
22. 1 2( ) cos cosx t A t A t
IM Spectra in a Cascade (I)
identify the IM products in a cascade
23. IM Spectra in a Cascade (II)
Adding the amplitudes of the IM products, we have
Add in phase as worst-case scenario.
Heavily attenuated in narrow-band circuits.
Thus, if each stage in a cascade has a gain greater than unity, the nonlinearity of the latter
stages becomes increasingly more critical because the IP3 of each stage is equivalently scaled
down by the total gain preceding that stage.
For more stages:
25. Experiment Measurement IP3
Amplifier Two-Tone Test
Mixer Two-Tone Test
1
1 2 1
0
2 33 2
in
IP
P P G
P P P
1 2 12 3
3 0
3 2
3
IP
IP
P P P
IIP P G
27. Effects of Nonlinearity: AM/PM Conversion
AM/PM Conversion arises in systems both dynamic and nonlinear.
Phase shift of
fundamental, Const.
Higher harmonic
If R1C1(t)ω1 << 1 rad
Assume that
obtaining
Undesired phase deviation (PM) that is caused by amplitude variations (AM) of the system.
AM/PM Conversion (APC)
1 1( ) cosinV t V t
Sinusoid frequency ω1 through a
first-order low-pass RC section
28. No AM/PM conversion because of the first-order dependence of C1 on Vout.
First order voltage dependence:
AM/PM Conversion: Time-Variation of Capacitor
29. Example of AM/PM Conversion: Second
Order Voltage Dependence
Suppose C1 in above RC section is expressed as C1 = C0(1 + α1Vout + α2Vout
2). Study the AM/PM
conversion in this case if Vin(t) = V1 cos ω1t.
The phase shift of the fundamental now contains an
input-dependent term, -(α2R1C0ω1V1
2 )/2.
This figure also suggests that AM/PM conversion
does not occur if the capacitor voltage dependence
is odd-symmetric.
Figure below plots C1(t) for small and large input swings, revealing that Cavg indeed depends on
the amplitude.
Phase shift of
fundamental, input-depet.