07 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 1 Grounding Grounds: –Common reference for the circuit –Safety What is the potential problem.

Slides:

Advertisements

Similar presentations

Lecture 2 Operational Amplifiers

Advertisements

MAGNETIC EFFECTS OF ELECTRIC CURRENT

CHAPTER 3: SPECIAL PURPOSE OP-AMP CIRCUITS

ECE201 Lect-161 Operational Amplifiers ( ) Dr. Holbert April 3, 2006.

Grounding Issues and Interfacing Balanced and Unbalanced Signals.

M.PEGORARO Grounding Workshop 24th Jan 08 DT GROUNDING & SHIELDING Presented by A. BENVENUTI.

Magnetic Circuits and Transformers

Lecture 1: Safety and Protection. 1. A robot may not injure a human being or, through inaction, allow a human being to come to harm. 2. A robot must obey.

Instrumentation: ground and noise Temperature Measurement.

Introduction to the OP AMP

ECE 201 Circuit Theory I1 Introduction to the Operational Amplifier μA 741 OP AMP.

Lecture21 Ohm's Law (2.1) Kirchhoff's Laws (2.2) Prof. Phillips January 24, 2003.

Announcements HW #1 due Thursday, Sept. 9, in EE40 homework box in 240 Cory

ECE 2006 Chapter 5: Operational Amplifiers. Differential Amplifier Not Practical Prior to IC Fabrication 2 Inputs, Output is A v *(V 1 - V 2 )

Phy 103: Fundamentals of Physics Chapter 25: Electromagnetic Induction Lecture Notes.

Operation Amplifier. Golden Rules of OP Amp 1.i in =0, no current flow into op amp. 2.V + =V - Typically one end of op amp is connected to ground, therefore,

Transformers and Coupled Circuits

AC Electricity Why AC? Distribution. Winter 2012 UCSD: Physics 121; Getting Power to Our Homes Let’s power our homes with DC powerLet’s power our.

Chapter 7. Voltage Remember: Atoms are in EVERYTHING and they are made up of equal amounts of positive and negative charges. Battery: uses chemical energy.

12 - Winter 2006 ECE ECE 766 Computer Interfacing and Protocols 1 Interfaces Transmission of data from the source to a device or from a device to the destination.

Objective of the Lecture Describe a basic electric circuit, which may be drawn as a circuit schematic or constructed with actual components.

CHAPTER - 13 MAGNETIC EFFECTS OF ELECTRIC CURRENT

Electricity Foundations of Physics. Electricity The movement of charge from one place to another Requires energy to move the charge Also requires conductors.

Prof. David R. Jackson ECE Dept. Fall 2014 Notes 5 ECE 2317 Applied Electricity and Magnetism Notes prepared by the EM Group University of Houston 1.

The physical network Unit objective: Identify network cables and connectors, and use networking tools.

Electromagnetic Induction

Cisco 1 - Networking Basics Perrine. J Page 19/3/2015 Chapter 3 Which of the following correctly describes the type of signal that the network media carries?

Series Circuits Series circuit: a circuit in which all parts are connected end to end to provide a single path for the current. Ammeters are always placed.

PROFIBUS wiring/installation can be done with:

Communication channels and transmission media

1 Electronics & Signals Honolulu Community College Cisco Academy Training Center Semester 1 Version

How does AC line noise create problems?

Circuits and Electronics. Circuits A circuit is a closed path through which a continuous charge can flow. A circuit is a closed path through which a continuous.

Circuit Basics Direct Current (DC) Circuits 1.5 V + – wire open switch closed switch 2-way switch ideal battery capacitor resistor 47  F 4.7 k  These.

Wiring and Grounding.

LECTURER PROF.Dr. DEMIR BAYKA AUTOMOTIVE ENGINEERING LABORATORY I.

Domestic Wiring Two wires come from the power pole to the house. The ACTIVE wire is 240 V RMS. The NEUTRAL wire is 0 V and is connected to.

Differential Preamp Stephen Kaye New Preamp Design Motivation Move preamplifier from controller to the Vacuum Interface Board (VIB) Amplifies.

POWER CIRCUIT & ELECTROMAGNETICS

Direct Current Circuits Sections 1, 2, 5 Chapter 29.

Biomedical Instrumentation I

Ground loops Why grounding is so important ?DefinitionGround loops :(Introduction)where ground loops affect ?Ground loops are created by :Solutions.

Bits (0s and 1s) need to be transmitted from one host to another. Each bit is placed on the cable as an electrical signal or pulse. On copper cable the.

SIGMA INSTITUTE OF ENGINEERING

Chapter 20 Capacitors in Series and Parallel Capacitors in Circuits Like resistors, capacitors in circuits can be connected in series, in parallel, or.

Magnetically Coupled Circuits Instructor: Chia-Ming Tsai Electronics Engineering National Chiao Tung University Hsinchu, Taiwan, R.O.C.

Shielded Wires Let us say that the voltages measured at the terminal of the receptor circuit are beyond the desired level. What can we do? Two common solutions.

11/22/2004EE 42 fall 2004 lecture 351 Lecture #35: data transfer Last lecture: –Communications synchronous / asynchronous –Buses This lecture –Transmission.

Prof. D. Wilton ECE Dept. Notes 5 ECE 2317 Applied Electricity and Magnetism Notes prepared by the EM group, University of Houston.

Channels of Communication HL – Option F.4 Mr. Jean.

Transformer Transformer is used to increase or decrease AC Voltage (potential difference). Transformer is consisted of a soft iron core, a primary coil,

Magnetism #2 Induced EMF Ch.20. Faraday’s Law of Induction We now know that a current carrying wire will produce its own magnetic field with the lines.

Programmable Logic Controllers

DC Inductance review… X X X X

Advanced Training 2009 Topics to be covered Noise Grounding Safety System Gain Considerations Auxiliary Fed Subwoofers.

Network Media. Copper, Optical, Fibre (Physical Layer Technologies) Introduction to Computer Networking.

Closed Circuits In applications requiring the use of current, electrical components are arranged in the form of a circuit. A circuit is defined as a path.

OP-AMPs Op Amp is short for operational amplifier. An operational amplifier is modeled as a voltage controlled voltage source. An operational amplifier.

REVIEW of Static electricity Electricity A. Electric Charge 1. Static electricity is the accumulation of excess electric charges on an object. a. More.

Grounding & Shielding Ved Prakash Sandlas Director General

Electronics SL – Option C.3 HL – Option F.5. Operational Amplifier An amplifier is a device that takes a signal and makes its bigger. – An mp3 player.

electronics fundamentals

The Electric Circuit.

Applied Electricity and Magnetism

Microstrips as Transmission Lines

RS-422 Interface.

CHAPTER - 13 MAGNETIC EFFECTS OF ELECTRIC CURRENT

Presentation transcript:

07 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 1 Grounding Grounds: –Common reference for the circuit –Safety What is the potential problem of grounding? –Improper grounding may induce noise on the transmission lines Black White Green Add independent safety ground

07 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 2 Grounding Problem: Faraday’s Law of Induction  Avoid ground loops Ground loop current

07 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 3 Spatial Dependence Within a cabinet vs. Between two buildings D

07 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 4 Shielding Techniques Metal Box Noise Source Relative voltages inside the metal box are always equal Connect the shield to the signal ground to reduce feedback effects induced by the shield. C1C1 C2C2 C3C3 C1C1 C3C3 C2C2 C3C3 C1C1 Short this impedance

07 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 5 Where to Ground the Shield? C Noise Voltage AC loop through signal wire C Noise Voltage AC loop through shield Shield should be connected to the earth ground at input reference. What if we interconnect two devices in different buildings?

07 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 6 Long Paths Problem: Two distant, connected chassis grounded at different points may carry large currents  Break the chassis connection Solutions: –Use larger signals to increase SNR –Use light as medium Fiber optic link Optical isolators (phototransistor and LED in a pack) –Use balanced (double-ended, differential) connections

07 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 7 Balanced Connections Both chassis are isolated electrically Noise induced on both lines Signal carried on each line: s(t) and –s(t) –Differential mode gain = –Common mode gain = –Differential mode gain >> common mode gain Noise Voltage + -

07 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 8 Crosstalk due to Bad Grounds Ideal Model of Actual Resistance of bad ground

07 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 9 UTP Revisited Faraday’s Law of Induction: Direction of the induced current. A. -A/4 A/4-A/4A/4