Noise and Interference Any signal or phenomena which degrades signal to noise ratio (S/N). External 1.Thermal noise (raw or amplified) 2.On-channel unwanted.

Slides:

Advertisements

Similar presentations

Noise Lecture 6.

Advertisements

Chapter 3. Noise Husheng Li The University of Tennessee.

Chapter 1 Problems ECET 214 Prof. Park NJIT.

Electrical Noise Wang C. Ng.

CERN Technical Training 2005

Low Noise Amplifier Design

Lecture 4 Noise, signal/noise ratio, detection limit.

Prof. ParkELC 2221 Lecture 1: Introductory Topics Prof. Park ELC 222 Essex County College.

1 School of Electrical, Electronics and Computer Engineering University of Newcastle-upon-Tyne Noise in Communication Systems Noise in Communication Systems.

M -m Signal Phasor: Noise Phasor: s(t)s(t) Phase Deviation due to noise:  n (t) Noise Performance for Phase Modulation For sinusoidal modulation, let.

Chapter 5: Signals and Noise

ELEC 303 – Random Signals Lecture 21 – Random processes

CHAPTER Noise 5.2 Transmission Media & EM Propagations.

RFIC Design and Testing for Wireless Communications A PragaTI (TI India Technical University) Course July 18, 21, 22, 2008 Lecture 4: Testing for Noise.

Lecture 8: Oscillators Noise in electronic systems

Chapter 6 Photodetectors.

4/11/2006BAE Application of photodiodes A brief overview.

COMMUNICATION SYSTEM EECB353 Chapter 4 NOISE ANALYSIS

5. SOURCES OF ERRORS Noise types

3/26/2003BAE of 10 Application of photodiodes A brief overview.

Johnson-Nyquist Thermal Noise By: Mohammad Ali Ahmadi Pajouh AUT 2007.

Chapter 1 : Introduction to Electronic Communications System

ECE 590 Microwave Transmission for Telecommunications Noise and Distortion in Microwave Systems March 18, 25, 2004.

Biomedical Instrumentation Signals and Noise Chapter 5 in Introduction to Biomedical Equipment Technology By Joseph Carr and John Brown.

Define Problem Select Appropriate Methods Obtain and store sample Pre-treat sample Perform required measurements Compare results with standards Apply necessary.

1 LECTURE 7. Contents 5.Sources of errors 5.1.Impedance matching Non-energetic matching Energetic matching Non-reflective matching To.

ECEN 5341/4341 Lecture 15 Feb 17, Noise Sources 2. Minimal levels of signal detection. 3. Some characteristic s of Neurons. An Important Reference.

1 In order to reduce errors, the measurement object and the measurement system should be matched not only in terms of output and input impedances, but.

12007 Introduction in Telecommunication (121009) Chris Roeloffzen Chair: Telecommunication engineering (EWI) Floor 8 HOGEKAMP EL/TN building (north) Telephone.

Ya Bao, South Bank University 1 Noise Richard Read, The Essence of Communications Theory, Chapter 3.

CHAPTER Noise 5.2 Transmission Media & EM Propagations EKT 231 : COMMUNICATION SYSTEM CHAPTER 5 : NOISE IN COMMUNICATION SYSTEM.

Sources of noise in instrumental analysis

Noise in SiGe HBT. outline Basic concepts and terminology about noise Representation of noise in bipolar by linear two- ports RF noise in bipolar –A unified.

NOISE IN COMMUNICATION CHANNELS

Chapter 10: Noise In Microwave Circuits

TELECOMMUNICATIONS Dr. Hugh Blanton ENTC 4307/ENTC 5307.

教育部網路通訊人才培育先導型計畫 Probability, Random Processes and Noise 1 Outline 5.1 Probability Theory 5.2 Random Variables 5.3 Random Processes 5.4 Transmission of.

Electronic Noise Noise phenomena Device noise models

Chapter 1 : Part 3 Noise. Noise, interference and distortion  Noise  unwanted signals that coincide with the desired signals.  Two type of noise: internal.

ECE 4710: Lecture #37 1 Link Budget Analysis  BER baseband performance determined by signal to noise ratio ( S / N ) at input to detector (product, envelope,

CHAPTER 1 Part 2.1  Noise.

Noise and Data Errors Nominal Observation for “1” Nominal Observation for “0” Probability density for “0” with Noise Probability density for “1” with Noise.

Noise in communication system

NOISE in Audio Systems Today we have a VIP guest in our class. His name is:

NOISE. NOISE AND DISTORTION NOISE : Noise can be defined as an unwanted signal that interferes with the communication of another signal. A noise itself.

CHAPTER 1 (cont…) Part 2.1  Noise. Objectives To differentiate the types of noise To calculate the thermal noise generated by a resistor To calculate.

Chapter 1: Introduction 1. Type of instrumental methods Radiation Electrical method Thermal properties Others 2. Instruments for analysis Non-electrical.

TE4201-Communication Electronics 1 2. Noise and Frequency Spectrum  AM communications system AM communications systemAM communications system  Noise.

1.1 What is Noise? any ‘unwanted” part of the analytical signal always some noise in a signal 1.2 Signal-to-noise ratio (S/N) for a set of data (replicate.

Eeng Chapter4 Bandpass Signalling  Bandpass Filtering and Linear Distortion  Bandpass Sampling Theorem  Bandpass Dimensionality Theorem  Amplifiers.

1 Noise Analysis Electrical Noise Electrical noise is defined as any undesirable electrical energy. Figure 57 shows the effect of noise on an electrical.

Noise in Communication Systems

What is thermal noise? Thermal noise in the resistance of the signal source is the fundamental limit on achievable signal sensitivity is unavoidable, and.

CHAPTER Noise 5.2 Transmission Media & EM Propagations.

EE354 : Communications System I

Eeng Chapter4 Bandpass Signalling  Bandpass Filtering and Linear Distortion  Bandpass Sampling Theorem  Bandpass Dimensionality Theorem  Amplifiers.

Chapter 3. Effect of Noise on Analog Communication Systems

Random Signals and Noise

Chapter 5: Signals and Noise

Analogue Electronic 2 EMT 212

CORPORATE INSTITUTE OF SCIENCE & TECHNOLOGY , BHOPAL DEPARTMENT OF ELECTRONICS & COMMUNICATIONS MOSFET NOISE MODELS - Prof . Rakesh K . JHA.

5.1 Noise 5.2 Transmission Media & EM Propagations

Signals and Noise Signal to Noise Ratio Types of Noise

Chapter4 Bandpass Signalling Bandpass Filtering and Linear Distortion

Electronic Noise Noise phenomena Device noise models

Optical Receivers 1. Photo Detectors

Introduction to Communication Systems (CNET - 222)

Noise I Abigail Firme.

INFORMATION CAPACITY AND NOISE

Presentation transcript:

Noise and Interference Any signal or phenomena which degrades signal to noise ratio (S/N). External 1.Thermal noise (raw or amplified) 2.On-channel unwanted emissions (interference) 3.Atmospheric noise 4.Man made noise Internal 1.Distortion 2.Harmonics 3.Shot Noise (carrier transit noise) 4.Flicker (1/f) Noise 5.Intermodulation For now, we will concentrate on Thermal and Shot Noise, as they: Are pervasive Are of similar magnitude Have similar spectral properties

Spectral Density Thermal and shot noise are broad spectrum (white) random noise processes, characterized by “flat spectral density”, which has two important implications: 1.Equal energy available at all frequencies 2.Noise power entering a system is proportional to the system’s acceptance bandwidth (usually, the bandwidth of one received channel). P N (watts) = ( ? ) x BW(hz) Fundamental Property of White Noise: Spectral Density N 0 (watts/Hz = joule) N 0 = Pwr/BW = kT for thermal noise. P th (watts) = kTB k = Boltzman’s constant = 1.38 x (j/K) ; T = Absolute Temp (K)

Thermal Noise Voltage P th (watts) Ideal Bandpass Filter B ~ RR V th (rms) Voltage Spectral Density: Current Spectral Density: For frequencies within B For frequencies outside of B Thermal noise source associated with random electron motion inside the resistance “R”

Shot Noise Shot Noise is represented by a random noise current generated in a semiconductor junction, in parallel with the junction dynamic resistance r d = 0.026v/I DC (for silicon). q = 1.6 x Coul (electron charge) Since noise currents and voltages are random and uncorrelated (orthogonal), they must always be considered as RMS values when multiple noise sources are present: I s (rms) rdrd Thevenin is alive and well in Prescott Arizona,... and the rest of the universe.

20 k  V n (rms) + 10 VDC - Example Ideal Bandpass Filter B = 100 kHz B

rdrd Ideal Bandpass Filter B 100 kHz ~ 20 k  V th I shot VnVn 20 k  I th Open Circuit Noise Voltage Note that the thermal noise represents a small contribution to the total noise voltage/current compared to the shot noise.