1) Oscillators generate oscillating signals and are used to generate carrier signals in transmitters, local oscillator signals in receivers, and clock signals in digital systems.
2) There are several common types of oscillators including Wien bridge oscillators, RC phase-shift oscillators, and LC oscillators.
3) Oscillators work by providing positive feedback through an amplifier and a frequency selective feedback network to sustain oscillations. The frequency is determined by the feedback network to satisfy the Barkhausen criterion for oscillations.
Infomatica, as it stands today, is a manifestation of our values, toil, and dedication towards imparting knowledge to the pupils of the society. Visit us: http://www.infomaticaacademy.com/
Electronic Oscillator ,classification ,linear and non linear ,circuit description , tank circuit ,working and operation , frequency of oscllation and Applications
Electrical Engineering is the Branch of Engineering. Electrical Engineering field requires an understanding of core areas including Thermal and Hydraulics Prime Movers, Analog Electronic Circuits, Network Analysis and Synthesis, DC Machines and Transformers, Digital Electronic Circuits, Fundamentals of Power Electronics, Control System Engineering, Engineering Electromagnetics, Microprocessor and Microcontroller. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus Visit : https://ekeeda.com/streamdetails/stream/Electrical-Engineering
Study of vco_Voltage controlled OscillatorNeha Mannewar
Voltage controlled Oscillator,Voltage controlled oscillator is a type of oscillator where the frequency of the output oscillations can be varied by varying the amplitude of an input voltage signal.Voltage controlled oscillators are commonly used in frequency (FM), pulse (PM) modulators and phase locked loops (PLL). Another application of the voltage controlled oscillator is the variable frequency signal generator itself.
Low power architecture of logic gates using adiabatic techniquesnooriasukmaningtyas
The growing significance of portable systems to limit power consumption in ultra-large-scale-integration chips of very high density, has recently led to rapid and inventive progresses in low-power design. The most effective technique is adiabatic logic circuit design in energy-efficient hardware. This paper presents two adiabatic approaches for the design of low power circuits, modified positive feedback adiabatic logic (modified PFAL) and the other is direct current diode based positive feedback adiabatic logic (DC-DB PFAL). Logic gates are the preliminary components in any digital circuit design. By improving the performance of basic gates, one can improvise the whole system performance. In this paper proposed circuit design of the low power architecture of OR/NOR, AND/NAND, and XOR/XNOR gates are presented using the said approaches and their results are analyzed for powerdissipation, delay, power-delay-product and rise time and compared with the other adiabatic techniques along with the conventional complementary metal oxide semiconductor (CMOS) designs reported in the literature. It has been found that the designs with DC-DB PFAL technique outperform with the percentage improvement of 65% for NOR gate and 7% for NAND gate and 34% for XNOR gate over the modified PFAL techniques at 10 MHz respectively.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
Infomatica, as it stands today, is a manifestation of our values, toil, and dedication towards imparting knowledge to the pupils of the society. Visit us: http://www.infomaticaacademy.com/
Electronic Oscillator ,classification ,linear and non linear ,circuit description , tank circuit ,working and operation , frequency of oscllation and Applications
Electrical Engineering is the Branch of Engineering. Electrical Engineering field requires an understanding of core areas including Thermal and Hydraulics Prime Movers, Analog Electronic Circuits, Network Analysis and Synthesis, DC Machines and Transformers, Digital Electronic Circuits, Fundamentals of Power Electronics, Control System Engineering, Engineering Electromagnetics, Microprocessor and Microcontroller. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus Visit : https://ekeeda.com/streamdetails/stream/Electrical-Engineering
Study of vco_Voltage controlled OscillatorNeha Mannewar
Voltage controlled Oscillator,Voltage controlled oscillator is a type of oscillator where the frequency of the output oscillations can be varied by varying the amplitude of an input voltage signal.Voltage controlled oscillators are commonly used in frequency (FM), pulse (PM) modulators and phase locked loops (PLL). Another application of the voltage controlled oscillator is the variable frequency signal generator itself.
Low power architecture of logic gates using adiabatic techniquesnooriasukmaningtyas
The growing significance of portable systems to limit power consumption in ultra-large-scale-integration chips of very high density, has recently led to rapid and inventive progresses in low-power design. The most effective technique is adiabatic logic circuit design in energy-efficient hardware. This paper presents two adiabatic approaches for the design of low power circuits, modified positive feedback adiabatic logic (modified PFAL) and the other is direct current diode based positive feedback adiabatic logic (DC-DB PFAL). Logic gates are the preliminary components in any digital circuit design. By improving the performance of basic gates, one can improvise the whole system performance. In this paper proposed circuit design of the low power architecture of OR/NOR, AND/NAND, and XOR/XNOR gates are presented using the said approaches and their results are analyzed for powerdissipation, delay, power-delay-product and rise time and compared with the other adiabatic techniques along with the conventional complementary metal oxide semiconductor (CMOS) designs reported in the literature. It has been found that the designs with DC-DB PFAL technique outperform with the percentage improvement of 65% for NOR gate and 7% for NAND gate and 34% for XNOR gate over the modified PFAL techniques at 10 MHz respectively.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
Online aptitude test management system project report.pdfKamal Acharya
The purpose of on-line aptitude test system is to take online test in an efficient manner and no time wasting for checking the paper. The main objective of on-line aptitude test system is to efficiently evaluate the candidate thoroughly through a fully automated system that not only saves lot of time but also gives fast results. For students they give papers according to their convenience and time and there is no need of using extra thing like paper, pen etc. This can be used in educational institutions as well as in corporate world. Can be used anywhere any time as it is a web based application (user Location doesn’t matter). No restriction that examiner has to be present when the candidate takes the test.
Every time when lecturers/professors need to conduct examinations they have to sit down think about the questions and then create a whole new set of questions for each and every exam. In some cases the professor may want to give an open book online exam that is the student can take the exam any time anywhere, but the student might have to answer the questions in a limited time period. The professor may want to change the sequence of questions for every student. The problem that a student has is whenever a date for the exam is declared the student has to take it and there is no way he can take it at some other time. This project will create an interface for the examiner to create and store questions in a repository. It will also create an interface for the student to take examinations at his convenience and the questions and/or exams may be timed. Thereby creating an application which can be used by examiners and examinee’s simultaneously.
Examination System is very useful for Teachers/Professors. As in the teaching profession, you are responsible for writing question papers. In the conventional method, you write the question paper on paper, keep question papers separate from answers and all this information you have to keep in a locker to avoid unauthorized access. Using the Examination System you can create a question paper and everything will be written to a single exam file in encrypted format. You can set the General and Administrator password to avoid unauthorized access to your question paper. Every time you start the examination, the program shuffles all the questions and selects them randomly from the database, which reduces the chances of memorizing the questions.
ACEP Magazine edition 4th launched on 05.06.2024Rahul
This document provides information about the third edition of the magazine "Sthapatya" published by the Association of Civil Engineers (Practicing) Aurangabad. It includes messages from current and past presidents of ACEP, memories and photos from past ACEP events, information on life time achievement awards given by ACEP, and a technical article on concrete maintenance, repairs and strengthening. The document highlights activities of ACEP and provides a technical educational article for members.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
CHINA’S GEO-ECONOMIC OUTREACH IN CENTRAL ASIAN COUNTRIES AND FUTURE PROSPECTjpsjournal1
The rivalry between prominent international actors for dominance over Central Asia's hydrocarbon
reserves and the ancient silk trade route, along with China's diplomatic endeavours in the area, has been
referred to as the "New Great Game." This research centres on the power struggle, considering
geopolitical, geostrategic, and geoeconomic variables. Topics including trade, political hegemony, oil
politics, and conventional and nontraditional security are all explored and explained by the researcher.
Using Mackinder's Heartland, Spykman Rimland, and Hegemonic Stability theories, examines China's role
in Central Asia. This study adheres to the empirical epistemological method and has taken care of
objectivity. This study analyze primary and secondary research documents critically to elaborate role of
china’s geo economic outreach in central Asian countries and its future prospect. China is thriving in trade,
pipeline politics, and winning states, according to this study, thanks to important instruments like the
Shanghai Cooperation Organisation and the Belt and Road Economic Initiative. According to this study,
China is seeing significant success in commerce, pipeline politics, and gaining influence on other
governments. This success may be attributed to the effective utilisation of key tools such as the Shanghai
Cooperation Organisation and the Belt and Road Economic Initiative.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
A review on techniques and modelling methodologies used for checking electrom...nooriasukmaningtyas
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
1. Oscillation: an effect that repeatedly and
regularly fluctuates about the mean value
Oscillator: circuit that produces oscillation
Characteristics: wave-shape, frequency,
amplitude, distortion, stability
•Ref:06103104HKN
•EE3110 Oscillator •1
2. Oscillators are used to generate signals, e.g.
◦ Used as a local oscillator to transform the RF
signals to IF signals in a receiver;
◦ Used to generate RF carrier in a transmitter
◦ Used to generate clocks in digital systems;
◦ Used as sweep circuits in TV sets and CRO.
•Ref:06103104HKN
•EE3110 Oscillator •2
4. •Ref:06103104HKN
•EE3110 Oscillator •4
For sinusoidal input is connected
“Linear” because the output is approximately sinusoidal
A linear oscillator contains:
- a frequency selection feedback network
- an amplifier to maintain the loop gain at unity
+
+
Amplifier (A)
Frequency-Selective
Feedback Network ()
Vf
Vs Vo
V
Positive
Feedback
6. •Ref:06103104HKN
•EE3110 Oscillator •6
Frequency Selection Network
Let
1
1
1
C
XC
and
1
1
1 C
jX
R
Z
2
2
1
C
XC
2
2
2
2
1
2
2
2
1
1
C
C
C jX
R
X
jR
jX
R
Z
Therefore, the feedback factor,
)
/
(
)
(
)
/
(
2
2
2
2
1
1
2
2
2
2
2
1
2
C
C
C
C
C
i
o
jX
R
X
jR
jX
R
jX
R
X
jR
Z
Z
Z
V
V
2
2
2
2
1
1
2
2
)
)(
( C
C
C
C
X
jR
jX
R
jX
R
X
jR
Vi Vo
R1 C1
R2
C2
Z1
Z2
7. •Ref:06103104HKN
•EE3110 Oscillator •7
can be rewritten as:
)
( 2
1
2
1
2
2
1
2
2
1
2
2
C
C
C
C
C
C
X
X
R
R
j
X
R
X
R
X
R
X
R
For Barkhausen Criterion, imaginary part = 0, i.e.,
0
2
1
2
1
C
C X
X
R
R
Supposing,
R1=R2=R and XC1= XC2=XC,
2
1
2
1
2
1
2
1
/
1
1
1
or
C
C
R
R
C
C
R
R
)
(
3 2
2
C
C
C
X
R
j
RX
RX
0.2
0.22
0.24
0.26
0.28
0.3
0.32
0.34
Feedback
factor
-1
-0.5
0
0.5
1
Phase
Frequency
=1/3
Phase=0
f(R=Xc)
8. •Ref:06103104HKN
•EE3110 Oscillator •8
Rf
+
R
R
C
C
Z1
Z2
R1
Vo
By setting , we get
Imaginary part = 0 and
RC
1
3
1
Due to Barkhausen Criterion,
Loop gain Av=1
where
Av : Gain of the amplifier
1
1
3
1
R
R
A
A
f
v
v
2
1
R
Rf
Therefore, Wien Bridge Oscillator
10. •Ref:06103104HKN
•EE3110 Oscillator •10
R R R
C C C
V1 Vo
I1 I2 I3
Solve for I3, we get
)
2
(
0
)
2
(
0
)
(
3
2
3
2
1
2
1
1
C
C
C
jX
R
I
R
I
R
I
jX
R
I
R
I
R
I
jX
R
I
V
C
C
C
C
C
jX
R
R
R
jX
R
R
R
jX
R
R
jX
R
R
V
R
jX
R
I
2
0
2
0
0
0
0
2
3
1
)
2
(
]
)
2
)[(
( 2
2
2
2
1
3
C
C
C jX
R
R
R
jX
R
jX
R
R
V
I
Or
11. •Ref:06103104HKN
•EE3110 Oscillator •11
The output voltage,
)
2
(
]
)
2
)[(
( 2
2
2
3
1
3
C
C
C
o
jX
R
R
R
jX
R
jX
R
R
V
R
I
V
Hence the transfer function of the phase-shift network is given by,
)
6
(
)
5
( 2
3
2
3
3
1 C
C
C
o
X
R
X
j
RX
R
R
V
V
For 180o phase shift, the imaginary part = 0, i.e.,
RC
R
X
X
R
X C
C
C
6
1
6
X
(Rejected)
0
or
0
6
2
2
C
2
3
and,
29
1
Note: The –ve sign mean the
phase inversion from the
voltage
12. •Ref:06103104HKN
•EE3110 Oscillator •12
+
~
Av Ro
Z1 Z2
Z3
1
2
Zp
The frequency selection
network (Z1, Z2 and Z3)
provides a phase shift of
180o
The amplifier provides an
addition shift of 180o
Two well-known Oscillators:
• Colpitts Oscillator
• Harley Oscillator
13. •Ref:06103104HKN
•EE3110 Oscillator •13
+
~
Av Ro
Z1 Z2
Z3
Zp
Vf Vo
3
2
1
3
1
2
3
1
2
)
(
)
//(
Z
Z
Z
Z
Z
Z
Z
Z
Z
Zp
For the equivalent circuit from the output
p
o
p
v
i
o
p
o
p
o
i
v
Z
R
Z
A
V
V
Z
V
Z
R
V
A
or
Therefore, the amplifier gain is obtained,
)
(
)
(
)
(
3
1
2
3
2
1
3
1
2
Z
Z
Z
Z
Z
Z
R
Z
Z
Z
A
V
V
A
o
v
i
o
o
o
f V
Z
Z
Z
V
V
3
1
1
Zp
AvVi
Ro
+
+
Vo
Io
14. •Ref:06103104HKN
•EE3110 Oscillator •14
The loop gain,
)
(
)
( 3
1
2
3
2
1
2
1
Z
Z
Z
Z
Z
Z
R
Z
Z
A
A
o
v
If the impedance are all pure reactances, i.e.,
3
3
2
2
1
1 and
, jX
Z
jX
Z
jX
Z
The loop gain becomes,
)
(
)
( 3
1
2
3
2
1
2
1
X
X
X
X
X
X
jR
X
X
A
A
o
v
The imaginary part = 0 only when X1+ X2+ X3=0
It indicates that at least one reactance must be –ve (capacitor)
X1 and X2 must be of same type and X3 must be of opposite type
2
1
3
1
1
X
X
A
X
X
X
A
A v
v
With imaginary part = 0,
For Unit Gain & 180o Phase-shift,
1
2
1
X
X
A
A v
15. •Ref:06103104HKN
•EE3110 Oscillator •15
R L1
L2
C
R
C1
C2
L
Hartley Oscillator Colpitts Oscillator
T
o
LC
1
1
2
RC
C
gm
2
1
2
1
C
C
C
C
CT
C
L
L
o
)
(
1
2
1
2
1
RL
L
gm
16. •Ref:06103104HKN
•EE3110 Oscillator •16
R
C1
C2
L
Equivalent circuit
In the equivalent circuit, it is assumed that:
Linear small signal model of transistor is used
The transistor capacitances are neglected
Input resistance of the transistor is large enough
+
V
gmV
R C1
C2
L
17. •Ref:06103104HKN
•EE3110 Oscillator •17
)
(
1
1 L
j
i
V
V
At node 1,
where,
V
C
j
i 2
1
)
1
( 2
2
1 LC
V
V
Apply KCL at node 1, we have
0
1
1
1
2
V
C
j
R
V
V
g
V
C
j m
0
1
)
1
( 1
2
2
2
C
j
R
LC
V
V
g
V
C
j m
0
)
(
1
2
1
3
2
1
2
2
C
LC
C
C
j
R
LC
R
gm
For Oscillator V must not be zero, therefore it enforces,
+
V
gmV
R C1
C2
L
node 1
I1
I2
I3
I4
V
18. •Ref:06103104HKN
•EE3110 Oscillator •18
Imaginary part = 0, we have
0
)
(
1
2
1
3
2
1
2
2
C
LC
C
C
j
R
LC
R
gm
T
o
LC
1
1
2
RC
C
gm
2
1
2
1
C
C
C
C
CT
Real part = 0, yields
19. The frequency stability of an oscillator is
defined as
Use high stability capacitors, e.g. silver
mica, polystyrene, or teflon capacitors and
low temperature coefficient inductors for
high stable oscillators.
•Ref:06103104HKN
•EE3110 Oscillator •19
C
ppm/
T
o
o
o d
d
1
20. In order to start the oscillation, the loop
gain is usually slightly greater than unity.
LC oscillators in general do not require
amplitude stabilization circuits because of
the selectivity of the LC circuits.
In RC oscillators, some non-linear devices,
e.g. NTC/PTC resistors, FET or zener
diodes can be used to stabilized the
amplitude
•Ref:06103104HKN
•EE3110 Oscillator •20