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27 Threads found on 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 (...)
Hi, i wanted to ask how are the standard difference signal lines rules when drawing differential lines in pcb layout? (please help, i need this as soon as it can be)
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
Hi all, I used two-port VNA to measure DUT's impedance,and i can get S11/S22/S21/S12. The measurement is done by dual coaxial pigtail and get some data,redo by pcb pigtails and also get some data. but i fond the datum are not the same,for example,Z11 from the VNA is 10-j100.2 by coaxial method,but Z11 from the VNA is 10.1-j140.5 by pcb (...)
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 (...)
Hello, this is Shenzhen Haichuanyingxin Technology Co.Tld. and we could offer you single sided, double sided,multilayer boards(4 to 28 layers), High-frequency multilayer board(many kinds of high-frequency material),Aluminum Substrate board, heavy Copper board, High TG board, characteristic impedance board, HDI board, FPC, Rigid-flex Circuits. If
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 @
Hi, I'm wondering if anyone can share the experience/ rule of thumb of the current capacity for vias in pcb layouts. THanks