PCB Stack-Up - FrontDoor

PCB Stack-Up - FrontDoor

18 Pages · 2010 · 89 KB · English

PCB Stack-Up Part 1. Introduction PCB stack-up is an important factor in determining the EMC performance of a product. A good stack-up can be very effective in

PCB Stack-Up - FrontDoor free download

Henry Ott Consultants http://www.hottconsultants.com/index.html PCB Stack-Up Part 1. Introduction PCB stack-up is an important factor in determining the EMC performance of a product. A good stack-up can be very effective in reducing radiation from the loops on the PCB (differential-mode emission), as well as the cables attached to the board (common-mode emission). On the other hand a poor stack-up can increase the radiation from both of these mechanisms considerably. Four factors are important with respect to board stack-up considerations: 1. The number of layers, 2. The number and types of planes (power & ground), 3. The ordering or sequence of the layers, and 4. The spacing between the layers. Usually not much consideration is given except as to the number of layers. In many cases the other three factors are of equal importance. Item number four is sometimes not even known by the PCB designer. In deciding on the number of layers, the following should be considered: 1. The number of signals to be routed and cost, 2. Frequency, 3. If must meet Class A or B emission requirements, 4. Will the PCB be in a shielded or unshielded enclosure, 5. The EMC engineering expertise of the design team. Often only the first item is considered. In reality all the items are of critical importance and should be considered equally. If an optimum design is to be achieved in the minimum amount of time and at the lowest cost, the last item can be especially important and should not be ignored. Multi-layer boards using ground and/or power planes provide significant reduction in radiated emission over two layer PCBs. A rule of thumb, that is often used, is that a four-layer board will produce 15

------------- Read More -------------

Download pcb-stack-up-frontdoor.pdf

PCB Stack-Up - FrontDoor related documents

Suma Break-Up D3.5 Heavy Duty Foaming Grease-Release Cleaner

5 Pages · 2017 · 60 KB · English

SAFETY DATA SHEET. Suma Break-Up D3.5 Heavy Duty Foaming Grease-Release Cleaner. Version Number: 5. Preparation date: 2016-01-14. 1. IDENTIFICATION Mississauga, Ontario L5L 0B3. Phone: 1-800-668-7171. Classification for the diluted product @ 1:20. This product, when diluted as 

Breaking Up Is Hard to Count

12 Pages · 2014 · 458 KB ·

Since 1980, vital statistics suggest that the number of divorces per 1,000 . compared with 52 % of divorces taking place 10 years before the survey or . Recession (Chowdury 2012; Cohen 2012; Schaller 2013)—the rise has .. A brief on the quality of data of marital and relationship instability in t

NF- B-dependent MicroRNA-125b Up-regulation Promotes Cell Survival by Targeting p38 upon ...

17 Pages · 2012 · 3.78 MB ·

DGCR8 microprocessor complex and cleaved into precursor. miRNAs, which can be . harbors a short fragment of the p38α gene 3-UTR, including these two gaonkar, V. (2010) ATM- and NEMO-dependent ELKS ubiquitination.

Primary Care Physician Follow-up of Distal Radius Buckle Fractures

11 Pages · 2016 · 1.25 MB · English

However, some studies suggest there may be knowledge deficits in the management of this injury by PCPs because education in musculoskeletal injuries is often lacking in family practice and pediatrics residency training.10–12 Thus, PCP follow-up may result in unwarranted referrals to orthopedic 

INTUIT ACADEMY Ten Steps to Cleaning Up Your Client’s QuickBooks

97 Pages · 2007 · 3.12 MB · English

This document is the same manual supplied in Intuit Academy training courses of the same name and is accountant-level web-based QuickBooks training opportunities

Option Measuring Up to C26 in Simple Applications with Fixed Set of Features

16 Pages · 2008 · 4.42 MB ·

From the “Manual“ tab, get easy access to a built-in electronic chart recorder Standard – Safety Transformers for Switched-Mode ABB provides “Manufacturer Certified Service.” Trained . configuration and application chemistry.

ATB Write-Up to Creative Solutions Accounting Conversion Guide

10 Pages · 2002 · 222 KB · English

client, choose CSA Help Topics from the Help menu and then; in the Index tab of the Help dialog, choose New. Client [File menu]. Note: You must complete the current period end date, current fiscal year end, and current payroll end date exactly as they appear in the ATB Write-Up system when you add

How to Set Up a Wireless Home Network - CalPac Technology

5 Pages · 2007 · 95 KB · English

Calpac Technology, 300 Montgomery Ave Oxnard CA. 93036 805-988-9540 How to Set Up a Wireless Home Network BE SURE TO PUT THIS ON PAPER BECAUSE

(Paper 12042) Blowing Up Safety Culture - The Lure and Trap of Accident

11 Pages · 2015 · 189 KB ·

THE LURE AND TRAP OF ACCIDENT made to: Hardware, Procedures, Organizations, Apparent causes included procedure violations, schedule 

Xplain: Setting Up Owners Online

3 Pages · 2010 · 3.12 MB · English

With HEROPM, your owners, tenants, and vendors can have online accounts that allow them to log on and see information you post for them, through your