This document discusses noise and its effects on systems. It defines noise as any unwanted input that limits a system's ability to process weak signals. Noise can come from various sources like resistors, transistors, mixers, power supplies, and the environment. The signal-to-noise ratio is used to measure the "noisiness" of a signal. Noise factor and noise figure are introduced as measures of a receiver's performance in the presence of noise. The concepts of noise temperature and its relationship to noise factor are also explained. Cascaded amplifiers and lossy networks are discussed in the context of calculating overall noise factor.
different types of internal and external noises, s/n ratio, s/n ratio of a tandem connection, noise factor, amplifier input noise, noise factor of amplifiers in cascade (friss's formula).
An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. An OTDR is the optical equivalent of an electronic time domain reflectometer. It injects a series of optical pulses into the fiber under test and extracts, from the same end of the fiber, light that is scattered (Rayleigh backscatter) or reflected back from points along the fiber. The scattered or reflected light that is gathered back is used to characterize the optical fiber. This is equivalent to the way that an electronic time-domain meter measures reflections caused by changes in the impedance of the cable under test. The strength of the return pulses is measured and integrated as a function of time, and plotted as a function of fiber length.
different types of internal and external noises, s/n ratio, s/n ratio of a tandem connection, noise factor, amplifier input noise, noise factor of amplifiers in cascade (friss's formula).
An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. An OTDR is the optical equivalent of an electronic time domain reflectometer. It injects a series of optical pulses into the fiber under test and extracts, from the same end of the fiber, light that is scattered (Rayleigh backscatter) or reflected back from points along the fiber. The scattered or reflected light that is gathered back is used to characterize the optical fiber. This is equivalent to the way that an electronic time-domain meter measures reflections caused by changes in the impedance of the cable under test. The strength of the return pulses is measured and integrated as a function of time, and plotted as a function of fiber length.
Audio video system slides, Microphone loudspeaker, Aduio devices slides, AVS ...dreamygyz
Presentation on Sound Processing devices like Microphone, Loud Speaker, Sound Characteristics. Study about various Microphones and loud speakers etc...
Negative amplifiers and its types Positive feedback and Negative feedbackimtiazalijoono
Negative amplifiers
What is Feedback?
Positive feedback
Negative feedback
Feedback Circuit
Principles of Negative Voltage Feedback In Amplifiers
Gain of Negative Voltage Feedback Amplifier
Advantages of Negative Voltage Feedback
Principles of Negative Current Feedback
Current Gain with Negative Current Feedback
Audio video system slides, Microphone loudspeaker, Aduio devices slides, AVS ...dreamygyz
Presentation on Sound Processing devices like Microphone, Loud Speaker, Sound Characteristics. Study about various Microphones and loud speakers etc...
Negative amplifiers and its types Positive feedback and Negative feedbackimtiazalijoono
Negative amplifiers
What is Feedback?
Positive feedback
Negative feedback
Feedback Circuit
Principles of Negative Voltage Feedback In Amplifiers
Gain of Negative Voltage Feedback Amplifier
Advantages of Negative Voltage Feedback
Principles of Negative Current Feedback
Current Gain with Negative Current Feedback
Optical Fiber Communication Part 3 Optical Digital ReceiverMadhumita Tamhane
Current generated by photodetector is very weak and is adversely effected by random noises associated with photo detection process. When amplified, this signal further gets corrupted by amplifiers. Noise considerations are thus important in designing optical receivers.
Most meaningful criteria for measuring performance of a digital communication system is average error probability, and in analog system, it is peak signal to rms noise ratio. ...
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Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
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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.
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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.
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1. Noise and its variousNoise and its various
effectseffects
Prepared by:Prepared by:
Kushagra Ganeriwal (130010111009)Kushagra Ganeriwal (130010111009)
Kamlesh Desai (130010111006)Kamlesh Desai (130010111006)
Sweetu Ratnani (130010111048)Sweetu Ratnani (130010111048)
Guided by:Guided by:
Prof. Mehul Thakkar (EC Dept.)Prof. Mehul Thakkar (EC Dept.)
2. NoiseNoise
Any unwanted input is termed as noise.Any unwanted input is termed as noise.
Limits systems ability to process weak signalsLimits systems ability to process weak signals
Sources:Sources:
1.1. Random noise in resistors and transistorsRandom noise in resistors and transistors
2.2. Mixer noiseMixer noise
3.3. Undesired cross-coupling noiseUndesired cross-coupling noise
4.4. Power supply noisePower supply noise
capability of detecting weak signals in presence of large-amplitudecapability of detecting weak signals in presence of large-amplitude
signalssignals
““noisiness” of the signal measure = signal-to-noise ratio (frequency-noisiness” of the signal measure = signal-to-noise ratio (frequency-
dependant)dependant)
4. Noise factorNoise factor
““The noise factor, at a specified input frequency, is defined as theThe noise factor, at a specified input frequency, is defined as the
ratio of (1) the total noise power per unit bandwidth available atratio of (1) the total noise power per unit bandwidth available at
the output port when noise temperature of the input termination isthe output port when noise temperature of the input termination is
standard (290 K) to (2) that portion of (1) engendered at the inputstandard (290 K) to (2) that portion of (1) engendered at the input
frequency by the input termination.”frequency by the input termination.”
sourcetoduenoiseoutputavailable
powernoiseoutputavailable
F
−−−−−
−−−
=
5. It is a measure of the degradation of SNR due to the noise added.It is a measure of the degradation of SNR due to the noise added.
SNR gets worse as we process the signalSNR gets worse as we process the signal
Spot noise factor, Quantitative measure of receiver performance wrtSpot noise factor, Quantitative measure of receiver performance wrt
noise for a given bandwidthnoise for a given bandwidth
Noise figureNoise figure
Quantitative measure of receiver performance wrt noise for a givenQuantitative measure of receiver performance wrt noise for a given
bandwidthbandwidth
Noise figureNoise figure
Typically 8-10 db for modern receiversTypically 8-10 db for modern receivers
6. Amplifier input noise in terms of noise figureAmplifier input noise in terms of noise figure
Noise Factor (linear not dB) of a
receiver is the ratio of the SNR at its input to the ratio of the SNRat
its output.
NoiseFactor
F(linear)= SNR_input[linear]/SNR_output[linear]
Noise Factor_F[dB]= SNR_input[dB] - SNR_output[dB]
NoiseFigure_NF[dB]= 10*LOG (NoiseFactor_F(linear))
SNR at the output will always be smaller than the SNR at the input,
due to the fact that circuits always add to the noise in a system.
The Noise Factor, at a specified input frequency, is defined as the
ratio of the total Noise Power per unit bandwidth available at the
output port when noise temperature of the input termination is
standard (290K) to that portion of engendered at the input frequency
by the input termination.
8. Vs is the source voltage, Zs=Rs+jXs is the source impedance,Vts is
the thermal noise voltage generated by the source, and Vn and In
are the noise sources representing the noise generated by the
amplifier. The output voltage is given by
Where A is the voltage gain and Zi is the input impedance. The
equivalent noise input voltage Vni is defined as the voltage in series
with Vs that generates the same noise voltage at the output as all
noise sources in the circuit.
Noise factor and equivalent input noise generators
9. noise factor of a lossy networknoise factor of a lossy network
Input Noise Factor would be given as Fi = Si/Ni and Output Noise
Factor would be given as Fo = So/No. Therefore F = Fi/Fo.
10. Noise temperatureNoise temperature
The noise temperature is a means for specifying noise in terms ofThe noise temperature is a means for specifying noise in terms of
an equivalent temperature. The noise power is directly proportionalan equivalent temperature. The noise power is directly proportional
to temperature in degrees Kelvin and that noise power collapses toto temperature in degrees Kelvin and that noise power collapses to
zero at absolute zero (0°K).zero at absolute zero (0°K).
the equivalent noise temperaturethe equivalent noise temperature TTee is not the physical temperatureis not the physical temperature
of the amplifier, but rather a theoretical construct that is anof the amplifier, but rather a theoretical construct that is an
equivalentequivalent temperature that produces that amount of noise power.temperature that produces that amount of noise power.
The noise temperature is related to the noise factor by:The noise temperature is related to the noise factor by:
TTee = (F= (Fnn - 1) T- 1) Too
and to noise figure by:and to noise figure by:
11. noise temperature Tnoise temperature Tee, we can also define noise factor and noise, we can also define noise factor and noise
figure in terms of noise temperature:figure in terms of noise temperature:
The total noise in any amplifier or network is the sum of internallyThe total noise in any amplifier or network is the sum of internally
and externally generated noise. In terms of noise temperature:and externally generated noise. In terms of noise temperature:
PPn(total)n(total) = GKB(T= GKB(Too + T+ Tee))
wherewhere
PPn(total)n(total) is the total noise poweris the total noise power
12.
13. Behavior of Analog systems inBehavior of Analog systems in
presence of Noisepresence of Noise