FR-4 (or FR4) is a grade designation assigned to glass-reinforced epoxy laminate sheets, tubes, rods and printed circuit boards (PCB). FR-4 is a composite material composed of woven fiberglass cloth w
How to create a "fuse" in a PCB?
Can anyone share their experience(s) with designs that have failed due toexcessive heat caused by ex......
asked by jeff.loyer lastest answer by jrbarnes
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votes
[SI-List]: S parameters for Multi-point Topology
Hi All,I am extracting S parameters of multi-point topology where a traces startsfrom controller and......
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votes12
answers
[SI-LIST]: Differential Signal S Parameters
Hi All,I was extracting 4 port S parameters for differential signal on FR4 PCBtrace referenced to gr......
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votes4
answers
Why is my PCB loss so high?
We have had several boards made from Isola FR408HR.My understanding is that at 3 GHz loss should be ......
asked by joel lastest answer by bertsimonovich
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votes8
answers
Thermal properties of old pcbs
I am reviewing an old article (1968) in which it refers to "copper conductors an epoxy glass" and "c......
asked by dbrooks9 lastest answer by leeritchey
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votes3
answers
[SI-List]: Energy at the quarter-wave stub resona......
Hi All,I have a very basic query on quarter wave stubs.In a FR4 board, with typical Tx to Rx connect......
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votes6
answers
References on electrical properties of dielectric......
Does anyone know of good references explaining the relationship between dielectric materials and the......
asked by jeff.loyer lastest answer by jeff.loyer
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votes4
answers
Maximum trace length of PCIE 3.0 REFCLK in addin ......
Hi,I want to know is there any maximum trace length routed in Add-in card forPCIE_REFCLK (*PCI expre......
asked by malli.1729 lastest answer by Chris.Cotton
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votes8
answers
Dielcetric losses
Hi Gurus ,The dielectric losses (Tandelta ) for Rogers are less than Fr4 .Apart from this , is ther......
asked by dmarc-noreply lastest answer by dmarc-noreply
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votes6
answers
Inserion loss of fr4 , 50 ohm trace .
Hi friends ,We are designing a dual band receiver ( 2.4 Ghz & 5.5 Ghz ) on a Fr4 substrate . The len......
asked by sunil_bharadwaz lastest answer by weirsi
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votes28
answers
Microstrip or stripline for date rates 10Gbps
Hi, expertsSorry to take this thread out of box again. Have seen the old threads and papers, still w......
asked by emcesd lastest answer by Jose.Moreira
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votes2
answers
[SI_LIST] Rj pattern Dependency
Hi All,I am seeing one more weird issue on Jitter. Below is the same.I am trying to do PCIE3 Add-in ......
asked by ah.vinod lastest answer by Gert.Havermann
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votes8
answers
Re: Isola HSD Products
> Hi All,>> Here are the current Dk/Df modules for FR408HR, FR408HRIS, I-Speed,> I-SpeedIS and I-Te......
asked by fred.hickman
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votes0
answers
FR4 permittivity
Hi,I have recently received a PCB (dielectric= Isola PLC-FR-370HR) and its certificate of compliance......
asked by cyril.chastang lastest answer by Gert.Havermann
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votes10
answers
DDR3 route trace maxim length
Hi Experts,I have a question is that :How long we can route the DDR3-1600 trace on FR4 if the topolo......
asked by lipishang lastest answer by msrajesheee
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votes5
answers
WHich dielectric to use
I have to design a telecom system to run at 20 Gbps.I tried the following: 1. FR4 on backplane and......
asked by avtaarenator lastest answer by bertsimonovich
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votes2
answers
WG: Re: DF spec for PCB materials
The Specified Value is a maximum loss limit of every FR4 Material as per IPC. There are many mechani......
asked by Gert.Havermann lastest answer by karthikeyavelan.kandasamy
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votes1
answers
Temperature effects on backplanes?
Overt the last few years, I've been asked to support a mechanism whereby the transmitter's and rece......
asked by David.Bond lastest answer by weirsi
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votes4
answers
Query : RF Boards
Dear Sirs We have been testing the 100W PA  boards provided by you for last fortnight.  Unfortuna......
asked by aditya lastest answer by Gert.Havermann
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votes2
answers
Via stub math help needed....
All,While working on some SERDES nets, specifically trying to quantifythe effects of some via stubs,......
asked by ralph.wilson lastest answer by weirsi
6
answers