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27 Threads found on edaboard.com: Pcb Characteristic Impedance
Microwave engineering is its own field of study. Various pcb features can act as resonators and/or antennas, the choice of dielectric itself can have a large impact on performance, and characteristic impedance becomes a critical concept. So long as you can keep all of your trace lengths electrically short (smaller than one fifth of a (...)
Hi, from the following link : There is a polar diagram in VNA(Vector Network Analyzer) We are able to know the pcb layout trace length by phase variation. My que
Hi, I want to know on how to measure the characteristic impedance of a pcb trace.I know that the same can be measured through a TDR. But is it possible to measure using a network Analyzer? I can see a feature to plot Smith Chart in the network anlayzer. Can this be used to measure the characteristics (...)
Provide number of layers, pcb material (FR4) I presume, layers you are going to route d-+ on (inners or outers).
Hi, Here are my suggestions to route ethernet signals. I assume the interface speed is 100Mbps: 1. Keep the distance between PHY chip and Ethernet Transformer (magnetics) as short as possible. 2. Route the RX+, RX-, TX+ and TX- differential pairs as 100ohm differential characteristic impedance. You can use Saturn pcb tool kit (a free (...)
Hi all, I've got a trouble in measuring real characteristic impedance of very small transmission line on a real RF pcb. The problem is the transmission lines are printed on multi-layer pcb and very small (approximation of serveral mil). And I need to measure characteristic impedance of (...)
Hi to all.I want design pcb for 2GHZ to 2.5 GHZ.HOW can I provide 50 Ω for my pcb? w=.24mm er=3.48 h=.8mm T=78?m
I am doing a design using the SIM908. I want the pcb tracks going to the GSM/ GPS antennas to be 50 OHM characteristic impedance. I do not understand how to do this in Eagle.(or in any other) Can someone please advice me? thanks.
I need to measure the inductance of my microstrip pcb from 1 to 100MHz. It is already designed and matched to have a 50 ohm characteristic impedance and has SMA connectors on it. Is the the reactance (imaginary reading) from the Smith chart plot across this band from a vector network analyzer the same as what I would measure from an LCR (...)
Hi, To correctly tell pcb trace width for specific characteristic impedance (50 ohms in your case), you need to explain. 1. pcb trace width 2. pcb trace height above GND Plane 3. pcb material (FR4 or anyother) so that one may know thr Er constant for the mateial 4. Trace geometry / (...)
where or when in mentor graphics pads do you take of of the characteristic impedance of the signal traces on your pcb? Does it just default to 50 ohms without any effort?
Hi Group, I have been designing my low to medium speed (below 1Gbps or 2.5Gbps) pcbs in Atlium Designer using FR4 material. I found Altium Designer as very easy and very smart tool when it comes to schematic design, pcb layout design, pin swapping, parameter management, output file generation. I need to design a board in which I will have a X
pcb Dielectric Coefficient for FR4 is not constant by frequency so that the manufacturers give this coeffcient for certain frequency,temperature and relative humidity.Therefore the dielectric coeffcient which you used to calculate characteristic impedance for pcb traces migh not be correct. In additional to, if the operating (...)
When typical trace impedance is specified at 50 Ohm or 100 Ohm for example, what is the actual complex impedance? Does it matter? I assume for pcb traces like a microstrip it would be mainly capacitive? I'm also a little confused why frequency never seems to be factored into the calculations. Isn't the relative permittivity a function (...)
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Hello to all I am looking for appropriate paper which can describe in a useful way the advantage and the disadvantages of a pcb, multi layer, with a meshed ground plane. In the network I found the following one: Author: Bing-Zhong Wang "characteristic impedance of Meshed strip line" International Jounal of Infrared and Millimeter (...)
Hi, signal integrity (or SI) refers to pcb interconnection design. Therefore each piece of trace needs to be indicated in the simulation model. Each piece of trace is a TRANSMISSION LINE (like 50 ohm RF stuff you know) characterized by its characteristic impedance (be careful it is not necessary 50 ohm) and its lenght, that, in this (...)
A slab of pcb material doesn't have a characteristic impedance - a trace etched on the pcb material has a characteristic impedance. The impedance of a trace on a pcb can be measured and is dependendent on the width of the trace, the thickness of the copper (...)
Do you need the high speed lines to be impedance controlled? No need to be that complicated. Just tell us which lines to be controled, we'll adjust the width and choose the right prepreg material to meet the impedance. the impedance could be controled within +-5%. Mike @
I was just looking up this topic the other day and found this website: You can calculate the resistance of the via which you can then apply to your own current usage and see what kind of loss and heat generation will occur.