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

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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

4 years 8 months 21 days

0

votes

6

answers
3108 views

[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......

asked by ah.vinod lastest answer by ah.vinod

4 years 10 months

0

votes

12

answers
2650 views

[SI-LIST]: Differential Signal S Parameters


Hi All,I was extracting 4 port S parameters for differential signal on FR4 PCBtrace referenced to gr......

asked by ah.vinod lastest answer by ah.vinod

5 years 2 months 22 days

0

votes

4

answers
3034 views

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

5 years 5 months 16 days

0

votes

8

answers
2451 views

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

5 years 9 months 5 days

0

votes

3

answers
1847 views

[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......

asked by ah.vinod lastest answer by ah.vinod

5 years 10 months 28 days

0

votes

6

answers
2047 views

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

6 years 4 months 7 days

0

votes

4

answers
2101 views

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

6 years 4 months 13 days

0

votes

8

answers
2492 views

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

6 years 4 months 25 days

0

votes

6

answers
2051 views

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

6 years 10 months 7 days

0

votes

28

answers
2385 views

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

7 years 2 months 23 days

0

votes

2

answers
1932 views

[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

7 years 2 months 27 days

0

votes

8

answers
2117 views

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

7 years 7 months 9 days

0

votes

0

answers
1528 views

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

7 years 7 months 11 days

0

votes

10

answers
1817 views

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

7 years 11 months 10 days

0

votes

5

answers
1922 views

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

8 years 2 days

0

votes

2

answers
1622 views

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

8 years 1 month 23 days

0

votes

1

answers
1574 views

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

8 years 4 months 20 days

0

votes

4

answers
2025 views

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

8 years 7 months 29 days

0

votes

2

answers
1621 views

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

8 years 8 months 27 days

0

votes

34

answers
1941 views
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