This document discusses double sideband suppressed carrier amplitude modulation (DSB-SC AM). It describes the drawbacks of conventional AM and why DSB-SC was developed. The time domain representation and frequency spectrum of DSB-SC signals are shown. DSB-SC provides a power saving of 66.7% compared to conventional AM by suppressing the carrier. A balanced modulator circuit is used to generate DSB-SC signals by mixing the modulating signal with the carrier signal in a nonlinear manner.
Electric Circuits Lab Series RC Circuits Phase Angle, Phase Lag.docxpauline234567
Electric Circuits Lab
Series RC Circuits: Phase Angle, Phase Lag, and Capacitors as Integrators
I.
Objectives:
After completing this lab experiment using, you should be able to:
1. Understand the effect of frequency on capacitive reactance.
2. Measure the impedance of an RC circuit.
3. Measure the phase angle and phase lag of an RC circuit using the oscilloscope.
4. Draw the impedance and voltage phasor diagrams.
5. Understand how a capacitor integrates current.
II.
Parts List:
1. Resistor 100 Ω, 1 kΩ, 6.8 kΩ
2. Capacitors 0.1 µF, 0.01 µF
III.
Procedures:
Part I:
1.
Connect the following circuit.
Figure 1: RC Circuit
2.
Connect one DMM across the resistor and one DMM across the capacitor. Set both DMMs to read AC voltage.
Measure the voltage drop across each component. Record the result in
Table 1.
3. Use Ohm’s law to
calculate the current flowing through the resistor. Since the circuit in Figure 1 is a series RC circuit, the same current will flow through the capacitor and the resistor.
Record the result in
Table 1.
Total current, I =
4.
Calculate the capacitive reactance using Ohm’s law. Record the result in
Table 2.
Capacitive Reactance, XC =
5. Now,
calculate the capacitive reactance value using the equation below.
Record the result in
Table 1 under Computed Reactance, XC.
Capacitive Reactance,
Capacitor C1
Voltage across, R
846 mV
Voltage across, C
583 mV
Total Current, I
0.846 mA
Capacitive Reactance, XC
686 Ω
Computed Reactance, XC
Table 1: Calculated and measured values
6.
Adjust the function generator frequency following the steps in
Table 2. Use the DMM to
measure the voltage across the resistor and the capacitor.
Record your measurements below.
Frequency (in Hz)
VR
(measured)
VC
(measured)
I =
(calculated)
XC =
(calculated)
XC =
(calculated)
300
983 mV
186 mV
0.983 mA
189 Ω
1k
846 mV
583 mV
0.846 mA
686 Ω
3k
884 mV
468 mV
0.884 mA
529 Ω
5k
953 mV
302 mV
0.953 mA
317 Ω
7k
975 mV
221 mV
0.975 mA
227 Ω
9k
985 mV
174 mV
0.985 mA
177 Ω
11k
990 mV
145 mV
0.990 mA
147Ω
13k
993 mV
121 mV
0.993 mA
122 Ω
15k
994 mV
105 mV
0.994 mA
106 Ω
Table 2: Calculated and measured values
7.
Plot the graph for
Frequency vs. VC.
(Use Excel or Word to Create the Plot)
Plot 1: Frequency vs. VC
Part II:
8.
Build the circuit shown in Figure 2.
Figure 2: Series RC Circuit
9.
Set the source voltage amplitude to
1.5 Vp and
frequency to
500 Hz.
10.
Connect Channel .
Electric Circuits Lab Series RC Circuits Phase Angle, Phase Lag.docxpauline234567
Electric Circuits Lab
Series RC Circuits: Phase Angle, Phase Lag, and Capacitors as Integrators
I.
Objectives:
After completing this lab experiment using, you should be able to:
1. Understand the effect of frequency on capacitive reactance.
2. Measure the impedance of an RC circuit.
3. Measure the phase angle and phase lag of an RC circuit using the oscilloscope.
4. Draw the impedance and voltage phasor diagrams.
5. Understand how a capacitor integrates current.
II.
Parts List:
1. Resistor 100 Ω, 1 kΩ, 6.8 kΩ
2. Capacitors 0.1 µF, 0.01 µF
III.
Procedures:
Part I:
1.
Connect the following circuit.
Figure 1: RC Circuit
2.
Connect one DMM across the resistor and one DMM across the capacitor. Set both DMMs to read AC voltage.
Measure the voltage drop across each component. Record the result in
Table 1.
3. Use Ohm’s law to
calculate the current flowing through the resistor. Since the circuit in Figure 1 is a series RC circuit, the same current will flow through the capacitor and the resistor.
Record the result in
Table 1.
Total current, I =
4.
Calculate the capacitive reactance using Ohm’s law. Record the result in
Table 2.
Capacitive Reactance, XC =
5. Now,
calculate the capacitive reactance value using the equation below.
Record the result in
Table 1 under Computed Reactance, XC.
Capacitive Reactance,
Capacitor C1
Voltage across, R
846 mV
Voltage across, C
583 mV
Total Current, I
0.846 mA
Capacitive Reactance, XC
686 Ω
Computed Reactance, XC
Table 1: Calculated and measured values
6.
Adjust the function generator frequency following the steps in
Table 2. Use the DMM to
measure the voltage across the resistor and the capacitor.
Record your measurements below.
Frequency (in Hz)
VR
(measured)
VC
(measured)
I =
(calculated)
XC =
(calculated)
XC =
(calculated)
300
983 mV
186 mV
0.983 mA
189 Ω
1k
846 mV
583 mV
0.846 mA
686 Ω
3k
884 mV
468 mV
0.884 mA
529 Ω
5k
953 mV
302 mV
0.953 mA
317 Ω
7k
975 mV
221 mV
0.975 mA
227 Ω
9k
985 mV
174 mV
0.985 mA
177 Ω
11k
990 mV
145 mV
0.990 mA
147Ω
13k
993 mV
121 mV
0.993 mA
122 Ω
15k
994 mV
105 mV
0.994 mA
106 Ω
Table 2: Calculated and measured values
7.
Plot the graph for
Frequency vs. VC.
(Use Excel or Word to Create the Plot)
Plot 1: Frequency vs. VC
Part II:
8.
Build the circuit shown in Figure 2.
Figure 2: Series RC Circuit
9.
Set the source voltage amplitude to
1.5 Vp and
frequency to
500 Hz.
10.
Connect Channel .
Power point presentation of Amplitude modulation from DSBSC.pptxvairaprakash3
The equation of AM wave in simple form is given by,
eAM(t) = Ec sin 2πfct+(mE_c)/2 cos2π(fc + fm)t - (mE_c)/2 cos2π(fc - fm)t
Here, power of the carrier does not convey any information. Most of the power is transmitted in the carrier is not used for carrying information. Hence the carrier is suppressed and only sidebands are transmitted.Therefore, if the carrier is suppressed, only sidebands remain in the spectrum requiring less power.
DSB-SC Contains two side bands i.e USB & LSB
Power efficiency is 100%
% Power saving in DSB-SC w.r.t AM is 66.67%.
A novel voltage reference without the operational amplifier and resistorsIJRES Journal
novel voltage reference has been proposed and simulated using a 0.18μm CMOS process in
this paper. A near-zero temperature coefficient voltage is achieved in virtue of the bias voltage subcirciut which
consists of two MOSFETs operating in the saturation region. The kind of bias voltage subcirciut is used to
adjust the output voltage and compensate the curvature. The output voltage is equal to the extrapolated
threshold voltage of a MOSFET at absolute zero temperature, which was about 591.5 mV for the MOSFETs we
used. The power supply rejection ratio (PSRR) is improved with three feedback loops. Although the output
voltage fluctuates with process variation, the circuit can monitor the process variation in MOSFET threshold
voltage. The simulation results show that the line regulation is 0.75 mV/V in a supply voltage range from 1.6 V
to 3.1 V and the temperature coefficient is around 10.8 ppm/℃ to 28.5 ppm/℃ at 9 different corners in a
temperature range from -20℃ to 120 ℃.
The PSRR is -70 dB at 100Hz with a supply voltage at 1.8 V, and the
layout size is 0.012mm2. The results of simulation and post layout simulation are almost the same.
Power point presentation of Amplitude modulation from DSBSC.pptxvairaprakash3
The equation of AM wave in simple form is given by,
eAM(t) = Ec sin 2πfct+(mE_c)/2 cos2π(fc + fm)t - (mE_c)/2 cos2π(fc - fm)t
Here, power of the carrier does not convey any information. Most of the power is transmitted in the carrier is not used for carrying information. Hence the carrier is suppressed and only sidebands are transmitted.Therefore, if the carrier is suppressed, only sidebands remain in the spectrum requiring less power.
DSB-SC Contains two side bands i.e USB & LSB
Power efficiency is 100%
% Power saving in DSB-SC w.r.t AM is 66.67%.
A novel voltage reference without the operational amplifier and resistorsIJRES Journal
novel voltage reference has been proposed and simulated using a 0.18μm CMOS process in
this paper. A near-zero temperature coefficient voltage is achieved in virtue of the bias voltage subcirciut which
consists of two MOSFETs operating in the saturation region. The kind of bias voltage subcirciut is used to
adjust the output voltage and compensate the curvature. The output voltage is equal to the extrapolated
threshold voltage of a MOSFET at absolute zero temperature, which was about 591.5 mV for the MOSFETs we
used. The power supply rejection ratio (PSRR) is improved with three feedback loops. Although the output
voltage fluctuates with process variation, the circuit can monitor the process variation in MOSFET threshold
voltage. The simulation results show that the line regulation is 0.75 mV/V in a supply voltage range from 1.6 V
to 3.1 V and the temperature coefficient is around 10.8 ppm/℃ to 28.5 ppm/℃ at 9 different corners in a
temperature range from -20℃ to 120 ℃.
The PSRR is -70 dB at 100Hz with a supply voltage at 1.8 V, and the
layout size is 0.012mm2. The results of simulation and post layout simulation are almost the same.
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.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
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.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
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.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
5. DSBSC-AM
• DSBSC – Double Side Band Suppressed Carrier
• Carrier signal is suppressed
• Modulated wave contains only upper and lower sidebands
• Transmitted power is saved
• Bandwidth is same as DSBFC-AM (2fm)
7. Time domain representation of DSBSC-AM wave
• Let the modulating signal is mathematically expressed as
Vm (t) Em cos(mt m) (1)
8. Time domain representation of DSBSC-AM wave
• Let the modulating signal is mathematically expressed as
Vm (t) Em cos(mt m) (1)
• Let the carrier signal is mathematically expressed as
Vc (t) Ec cos(ct c) (2)
9. Time domain representation of DSBSC-AM wave
• The instantaneous amplitude of the modulated
mathematically expressed as
VDSBSC (t) Vm (t)Vc (t) (3)
wave is
10. Time domain representation of DSBSC-AM wave
• The instantaneous amplitude of the modulated
mathematically expressed as
VDSBSC (t) Vm (t)Vc (t) (3)
wave is
VDSBSC (t) Em cosmt Ec cosct (4)
11. Time domain representation of DSBSC-AM wave
• The instantaneous amplitude of the modulated
mathematically expressed as
VDSBSC (t) Vm (t)Vc (t) (3)
wave is
VDSBSC (t) Em cosmt Ec cosct (4)
[cos(
2
V (t)
E E
c m c m
)t cos( )t] (5)
m c
DSBSC
12. Time domain representation of DSBSC-AM wave
• The instantaneous amplitude of the modulated
mathematically expressed as
VDSBSC (t) Vm (t)Vc (t) (3)
wave is
VDSBSC (t) Em cosmt Ec cosct (4)
[cos(
2
V (t)
E E
c m c m
)t cos( )t] (5)
m c
DSBSC
2
cos2
2
E cos2
V (t)
mE
m
c
mEc
cos 2 (f f )t (6)
c m
(f f )t
c
c
c f t
AM
17. DSBSC-AM power distribution
• The total power in AM-DSBFC envelope is expressed as
PUSB PLSB
Pt Pc (1)
m2
Pt Pc
2
Pc (2)
(3)
2
m2
P P 1
t c
18. DSBSC-AM power distribution
• The total power in AM-DSBFC envelope is expressed as
• The total power in AM-DSBSC envelope is expressed as
PUSB PLSB
Pt Pc (1)
m2
Pt Pc
2
Pc (2)
(3)
2
m2
P P 1
t c
(4)
Pt PUSBPLSB
2
m2
c
P (`5)
t
P
19. Power saving in DSBSC-AM
• Power saving in DSBSC wave is
Pt
SavDSBSC
t
P
Pt
(1)
P
20. Power saving in DSBSC-AM
• Power saving in DSBSC wave is
Pt
SavDSBSC
t
P
Pt
(1)
P
(1)
2 m2
2
PSavDSBSC
21. Power saving in DSBSC-AM
• Power saving in DSBSC wave is
• If modulation index is equal to 1, the total power saving in DSBSC-
AM wave is 66.7%
Pt
SavDSBSC
t
P
Pt
(1)
P
(1)
2 m2
2
PSavDSBSC
24. Balanced Modulator (BM)
• Two nonlinear devices are connected in balanced mode
• Two transistors are identical and the circuit is symmetrical
• Voltage across the windings of centre tap transformer is equal and
opposite in phase (Vm-Vm)
25. Balanced Modulator (BM)
• The modulating signal is fed in push-pull and the carrier voltage is fed
in parallel to a pair of identical transistors.
• The carrier voltage is thus applied to the two transistors in phase,
whereas the modulating voltages appear 180o
out of phase.
27. Balanced modulator
• The input voltage to the transistor T1 is expressed as
Vbc Vc (t) Vm (t) (1)
Vbc Vc cosct Vm cosmt (2)
• The input voltage to the transistor T2 is expressed as
28. Balanced modulator
• The input voltage to the transistor T1 is expressed as
Vbc Vc (t) Vm (t) (1)
Vbc Vc cosct Vm cosmt (2)
• The input voltage to the transistor T2 is expressed as
VbcVc (t) Vm(t) (3)
VbcVc cosct Vm cosmt (4)
• Using nonlinearity property, the collector current can be expressed
as
29. Balanced modulator
1 bc bc
i aV bV 2
(5)
• The input voltage to the transistor T1 is expressed as
Vbc Vc (t) Vm (t) (1)
Vbc Vc cosct Vm cosmt (2)
• The input voltage to the transistor T2 is expressed as
VbcVc (t) Vm(t) (3)
VbcVc cosct Vm cosmt (4)
• Using nonlinearity property, the collector current can be expressed
as
i aV bV2
(6)
1 bc bc
30. Balanced modulator
• Sub Eq.(2) and Eq.(4) in Eq.(5) an Eq.(6), we get
i a[V cos t V cos t] b[V cos t V cos t]2
(7)
1 c c m m c c m m
31. Balanced modulator
• Sub Eq.(2) and Eq.(4) in Eq.(5) an Eq.(6), we get
i a[V cos t V cos t] b[V cos t V cos t]2
(7)
1
c c m m c c m m
i a[V cos t V cos t] b[V2
cos2
t V 2
cos2
t
1
c c m m c c m m
2VcVm cosc tcos mt] (8)
32. Balanced modulator
• Sub Eq.(2) and Eq.(4) in Eq.(5) an Eq.(6), we get
i a[V cos t V cos t] b[V cos t V cos t]2
(7)
1 c c m m c c m m
i a[V cos t V cos t] b[V2
cos2
t V 2
cos2
t
1 c c m m c c m m
2VcVm cosctcos m t] (8)
i a[V cos t V cos t] b[V cos t V cos t]2
(9)
1 c c m m c c m m
33. Balanced modulator
• Sub Eq.(2) and Eq.(4) in Eq.(5) an Eq.(6), we get
i a[V cos t V cos t] b[V cos t V cos t]2
(7)
1 c c m m c c m m
i a[V cos t V cos t] b[V2
cos2
t V 2
cos2
t
1 c c m m c c m m
2VcVm cosctcos mt] (8)
i a[V cos t V cos t] b[V cos t V cos t]2
(9)
1 c c m m c c m m
i a[V cos t V cos t] b[V2
cos2
t V 2
cos2
t
1 c c m m c c m m
2VcVm cosctcos mt] (10)
35. Balanced modulator
• The output AM voltage is given as
V0 K(i1 i1) (11)
• Sub Eq.(8) and Eq.(10) in Eq.(11)
36. Balanced modulator
• The output AM voltage is given as
V0 K(i1 i1) (11)
• Sub Eq.(8) and Eq.(10) in Eq.(11)
V0 2KaVm cosmt 4KbVcVm cosctcosmt (12)
37. Balanced modulator
• The output AM voltage is given as
V0 K(i1 i1) (11)
• Sub Eq.(8) and Eq.(10) in Eq.(11)
V0 2KaVm cosmt 4KbVcVm cosctcosmt (12)
V 2KaV cos
a
2bV
c
cos t (13)
c
m
0 m t 1
38. Balanced modulator
• The output AM voltage is given as
V0 K(i1 i1) (11)
• Sub Eq.(8) and Eq.(10) in Eq.(11)
V0 2KaVm cosmt 4KbVcVm cosctcosmt (12)
V0 2KaVm cosmt
1 m cosct (14)
a
ModulationIndex, m
2bVc
a
2bV
V 2KaV cos c
c
m
0 m cos t (13)
t 1
40. Working principle of ring modulator
• Diodes act as a perfect switches
• Amplitude and frequency of the carrier is higher than that of the
modulating signal
• Switching operation of diodes is controlled by the RF carrier signal
41. Mode 1: Carrier suppression
Operating in the positive half cycle of the carrier
42. Mode 1: Carrier suppression
Operation in the negative half cycle of the carrier