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44 Threads found on Cable Model Simulation
Dears, Can anyone tell me how to convert S-parameter cable model in touchstone format to Spice format so that I can simulate in Hspice?
Dear Krashkealoha If I have a touchstone 8-port cable model, how can I do the simulations in Hspice for transient analysis and also the S-parameters, can u give me an example?
Hi all, please tell me how to model cat5 cable in 100/1000M ethernet PHY transmitter simulation , I am pullzed in this for several months. IEEE 802.3 only gives 10M cable model , but it doesnot fit for 100/1000M. Thank you in advance!
Hi, Can anyone tell me where to get USB cable circuit model for simulation with the analog interface of the USB transceiver. Websites, books,ideas,,,etc are all welcomed. thanx in advance, regards,
who have LVDS cable model ( DVD rw pick-up head cable ) I measure real LVDS signal have "overshoot /undershoot" but in spice I use delay-line , waveform is very good .. by the way , have anyone simulation eye pattern for LVDS ?
For USB 2.0 PHY , how to model the cable in R/C/L for circuit simulation ?
Man, you have got a pile of questions. First of all, have you looked at the recently posted HFSS 9.2 documentation on elektroda Website? There is an example of coax connector. Even if it is not directly applicable, do the tutorial to get an insight. Your must start with a realy simplistic model and add details later. There are no real cylin
Hi, I have a simple question about the coplanar waveguide simulation in HFSS. How do I define the "port" for a non-ground CPW? And in reality, how can I connect the coaxial cable to the CPW? Can I connect the inner conductor to the central strip and the outer conductor to one side of the side ground?
how are the impedance and capacitance taken in account in a spice simulation. These are examples of them : osciloscope input: 1MΩ 13pF test probe: 10MΩ 15pF this values are in simulation set in series, parallel or how ? Fairly correct model with your value and 3 dB roll of around 12 MHz on 1 kOhm source.
Hello, I would like to use different mutual coupling in LTSPICE but I think it doesn't work. I have a three wire cable model with their 3 inductances L1 L2 L3 I would like to use these coupling : K1 L1 L2 0.3 K2 L2 L3 0.7 K3 L1 L3 0.7 I have the analytical formula to determine the equivalent inductance, and when I want to compare simulati
Hello! I'm trying to simulate a Biconical antenna in CST, but I having problems. It should be feed usind a coaxial cable thrugh the cones. Does anyone have some kind of advice for this simulation or any model that have good agreement with measures? Here is the model I have done, if someone wants to have a look, (...)
Hi, I´d like to know more about your problem. I suppose that you want to attach a coax cable to a rectangular wave guide, so my question is...Does your wave guide have a 50 Ohms termination in the side where the coax cable must be attached?. Does your coax cable will be the TE or TM excitation for the wave guide?. If you describe your (...)
For the purpose of training and education, I am looking for an example of using HFSS to visualize the effect of an antenna connected directly to a coaxial cable. How to visualize the external current in the coaxial and see the difference when connected to a BALUN. Anyone has a model like this?...Or any ideas?
Hi after a bit of problems now my Encoder is Locking. I've some error before the RS (My BER before RS is of the order of 7.7E-3) so I think I've some problem in my coding. So I've some questions: 1- Have I to reset the Trellis Dlatch at each frame? 2- About the BER before RS of 7.7E-3 what does it mean? I think that I've problem on Trellis
I want to model the transmission line with resistor, cap and inductor, so I can simulate the E1 /T1 transeiver system, the bit rate is 2.048M/1.544Mbps. Do you have any simple models about the coaxial cable and Twisted pair line, relative papers and books are also good. thanks.
Thanks to everybody. The PCB "aggressor" is a parts of a system; the cable emission was measured with a capacitive clamp. One measure over the limit is @50MHZ (about 50dBpW). This is even one of foundamental frequencies on board. I want make some correction of terminantion at the ports, and try to get a measure of radiation with a near field pro
hi zhiweisim well both models are correct. however when you use trim ground plane model u cant use E=0 for Zmin it should be open or open add space u dont need to change the inner and outer radius of coax in the model because it doesnt matter which coax cable you are using practically. its characteristic impedance (...)
I'd try and use the transmission line model, and introduce perturbation of attenuation, mismatch of adaption and reflection, either from real cable specs, or your estimation values. Good luck! erikl
Thanks E-M-C it's useful and show that my simulation was right. I add Coaxial cable to my model and my result become better (thanks Plasma). my experience show for simulation of UWB antenna cable effect must be considered! but yet my result is not exactly results of Article.
Dear EMC Are you still be able to convert touchstone S-parameter format into Spice format? I have a USB30 cable model and I need to convert it into spice
I understand, that you are using individual transmission lines for DP and DN. This would still meet the common mode impedance range of 21..39 ohm, but not achieve the typical value of 30. You may want to use a combination of three transmission lines to model the typical charateristics more exactly. The difference only matters for the single end
Anyone has the true complaince model (cable+reference test channel) which can be used for Spice simulation?
Hello all, I never done I/O related works, but I have to design a test circuit which can send 4GHZ clock signal to oscilloscope. So I need helps from you guys. I will land an AC probe on a on-die landing pad, and this probe will be connected to a SMA cable. This cable will be connected to oscilloscope through SMA connector. Anybody tried
I think, the basic question is, if AWR has a suitable cable model and is using it in time domain simulation? Did you calculate the expectable pulse response by hand?
Hello ev'body, I'm using Pspice for circuit design, I have to insert a Coax model... I need these four attributes: R, C, L, G of RG-174/U Coax cable. So, R is resistance per length unit (Ω/m), so I found it using: R=(d/2)*(d/2)*π*ρ C is requested by my pro
Hi, is there a touchstone model sharing group? It would make sense to have a website where common parts like connectors (VPX, compact-PCI, PCIe-card-edge, SATA, RJ45) and cables (like CAT-5/6/e UTP, SATA...) have already created touchstone s-parameter files available for download. When I do system simulation, I can get my PCBs (...)
Hi What is the dielectric loss of the insulating material used in CAT-6 UTP cables? I can only find insertion loss in dB in google results, I could not find any webpage or product page stating the insulating material's dielectric loss tangent. I want to run a channel simulation with a UTP CAT-6 cable + 2 PCBs + transceiver (...)
If you have designed 3D model in HFSS... you can send snap of that to understand mechanism... Hi there, There might be several similar threads, but - please believe me - I couldn't find what I am searching for. I am in a project where we use HFSS for some simulations. Since we got really screwed up results for s
That is happening most likely because the cable is a dispersive medium. Not the dominant effect I presume. Neither for coaxial cables up to GHz, nor twisted pair telephone cables at lower frequencies.
hi to all. I wrote a 3D-FDTD code in matlab. I have a cylindrical dielectric antenna that surrounded by air(epsr=1).I know maxwell equations and discretized forms of them both in vaccum and dielectric.but I donn't know how import a coaxial feed to my dielectric antenna.this antenna is like of monopole antenna. I placed a differentiated gaussian
There can be many problems possible. But I feel the way u connected your wave_port with the actually patch, is not looking good. What you did is you drilled a hole (at specified position) in microstrip, then stuffed this hole with conducting material and connected a wave_port at the bottom. But you can feed conventi
I try your simulation and it is not possible, because your waveport isn't on a boundary. Instead of making a coaxial cable with vacuum. i would use a lumped port between the matching and the ground plane. For a first simulation this is accurate enough.
If you can get the device model,including active and passive,you can use ADS or MWO to do the seems the input current is not very high in this case(around 200mA),i think you donot need to use too thick cable to handle that.The additional VHF choke is to realize low pass function better than just one inductor,similar as you use several
Hi, I just checked the CST application web site. They have a short article on CAR simulations (cable Harness and antenna placement) on their web site. Just have look. For electrical very large structures FEM codes are not particulare well suited. Time Domain or MoM (MLFMM) codes are bet
hi, I don't think that in ADS there is a possibilty to model a coax cable, so u have to use IE3D or HFSS to do that.
you should model a metal fixture, which is oftern used to measure the device with microstrip as input/output by VNA. SMA which is connected with the coaxial cableis is mounted on the fixture. At the same time the fixture touches with the ground of the microstrip.
hi has anybody ever managed to design a single patch microstrip antenna fed by coaxial cable in HFSS with DESIRED resonating frequency for example: 12GHz i tested many dimensions of patch but never managed to set the frequency.
Thanks Biff! Additionally what is the optimal transition from microstrip to semi-rigid coax cable at 10+GHz? Is UT-085 semi-rigid small enough?
Hi, it's hard to know if TD or FD performs better before you actually try. I guess it depends on more the just the dielectric const. Other factors are the complexity of the model. Would you like to included some parts of the GPS receiver (handheld?) has well? In my experience with high dielectric antennas I have noticed that modeling the finite
Hello! I'm trying to simulate a Biconical antenna in CST, but I having problems. It should be feed usind a coaxial cable thrugh the cones. Does anyone have some kind of advice for this simulation or any model that have good agreement with measures? I have tried a subgrid-meshing to get enough mesh between the port and the metallic (...)
Gawd, there are some ill informed posters on this board! Passive Intermodulation Distortion in Connectors, cable and cable Assemblies
yeah,send me the feko file i have pm you. Actually in real life the cable is far longer than the segment you define in the model and maybe thats the problem. Try reducing the radius to diameter/16. or more until you get no error and check your results.Anywaysend me the specifications or the feko file
proteus does not have a phone model, but this is what you can do. pick the com-pim model in proteus get a usb to serial converter cable for the phone you are using insert the cable into the system check the com port number in device manager, if grreater than 4, reset it to something between 1 and 4 double click on the (...)
Hi, I am doing a small project of monopole and dipole antennas used in mobile devices.Here,the antennas (made of metal with thickness 0.3 mm) were placed on the inner layer of the mobile casing (casing is made of plastic) and is soldered from the device PCB 50ohm trace using coaxial cable to antenna feeding point. The design is working good in si