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83 Threads found on edaboard.com: Inductance Hfss
Humungus, for integrated circuit,a planar spiral inductor on silicon is too small for hfss. tendness towards surface in high freq may cause much different. So U can get a approache inductance value, but cannot get a sure Q. those just disturb me, so I must process a serial planar spiral inductors to make sure.
I am working on CMOS RF circuit and the package we choose has mutual inductance between neigher lead in its equivalent package model. I have never simulated such a mutual inductance before. Does anyone know how to simulate the mutual inductance? I am using ADS and Cadence SprectreRF for simulation tools. THX
I am developing a method to estimate semirigid coaxial cable parameters. This method needs a copper disc in order to short circuit the outter conductor and the center conductor. This disc has a hole in its center for the cable inner conductor to penetrate it (the disc is like a copper washer). Once conected to the cable, the current in the disc str
Hello, I would like to perform a simulation of simple coplanar waveguide structure to obtain a basic parameters like capacitance and inductance per length. I need those results to compare with results of my FEM simulation . Is it possible to simulate those parameters in hfss or CST? I have already basic experience in those simulators. Thanks,
I have designed a birdcage coil in hfss and trying to simulate it.However i can never see expected result.I cannot be sure about the connections and boundary canditions.I have some questions. 1_) Can i assign capacitance or inductance to 2D geometry. 2_)Some of my parts are detached, how can i be sure of their the material that th
Hi all, I am fairly new to EM field simulation. I am trying to simulate a 4-metal layer laminate with drilled vias - the bottom metal is GND. All my vias are shorted together. The objective is to quantify the inductance between the via top metal and the bottom GND plane. Please see the attached model in the zip file. When I define the lumped
Thanks dopradar, what are the formulas to calculate inductance from S parameter can we follow any standard method to design it. Line calculators are only for straight microstrip lines, how can one calculate the inductance of any arbitrary structure or that particular RFC inductor (you can see these in many circuits) In
Dear alll I'm just a newbie in hfss designing. I want to fnd out the characteristic of passive element using hfss (for example Y11 phase, Y11 magnitude, capacitance, inductance) I made a capacitor using LTCC process and then I simulate that using hfss. But the measured data differ from the simulation result. I (...)
Hi, all, I'm using hfss to simulate an on-chip inductor, but whatever setting I used, still get bad results comparing with the measured data: the inductance is about 0.1nH larger, and the quality factor is about 6 less. Someone told me that the current distribution of the inductor was not smooth. But I just don't know how to make it smooth? W
Hi, did you try to increase the simulation accuracy? this might help.. also when you increas the groudring which is in series with your inductor, apparently it will increase the inductance.. try to use large metal not just a thin trace as the ground ring.
hi for all I want to know how to assign a lumped element in hfss. in the other words, what is the size for the rectangle that I should use it even for the series or the shunt element I am trying to simulate a 3-way power divider. (the attachment) In that one the Left-Handed TL was used, where LHTL unit cell comprises a shunt inductance
When I simulate spiral inductor by hfss , I have some questions listed as below. 1.how can I get its inductance and Q value in hfss environment ? 2.which solution type should I select Driven Modal,Driven Terminal or Eigenmode ? 3.Because I am trying the 'Air structure' effect, so I want to combine two different air structure heights (...)
hi I meet with a problem during on-wafer spiral inductor simulation: the inductance and peak-Q-frequency agrees well with the measured results, while the Q-value is almost independent of number of turns, which is a contrast to the sharp decreasing curve by measurement. could someone clue me on this? thx
I designed two symmetry inductors. one is 1.5 circles and the other is 2 circles they have the same line width, gap inner and outer diameter. the difference is the 2 circle inductor don't need ground ring while the 1.5 circle inductor have. the simulation result is really amazing::!: the 1.5 circle inductor have a larger inductance and Q w
Maybe the inductance of your feed trace is messing up the result. It sounds like you have a good approach. Maybe try broadside coupled lines (one on bottom of substrate) instead of edge coupled. It may give a more balanced feed and the poles will be concentric around 1 axis. When you import into ADS you will need a balun or a some way of measu
Dear RF engineer, do have documentations about capacitance probe and inductance probe design in hfss? I need them for my understanding to design coaxial combline filter. thks a lot for your kind help.
I am doing on-chip spiral inductor characterization with hfss. I found that if metal 1 ground shield is added into the simulation, both Q and the achieved inductance get worse, which doesn't seem reasonable to me. Does anyone know if I'm missing anything, or if there is any special setting needed to do this kind of simulation with hfss? (...)
Hello, I am attempting to simulate a planar spiral made out of copper which has been etched on plastic substrate (no oxide) to help predict it's inductance and resistance but to also see the magnetic field around the structure if possible. I would like to know if anyone can help steer me in the right direction into how to go about this using H
Hi all! I would like to design RF printed PCB inductances/capatiances (mostly inductances). From 310 MHz to 1 GHz, FR4 with 35 um copper (for instance). Has anybody good hints, where to start? (I have EM simulators). Designer program kits, tutorials, literatures(pdf:)) are welcome! Thanx! Zoltan ps.: I will honor your help with po
Is it possible to estimate the inductance of a spiral inductor by hfss? Any formular?
Dear all, How can I de-embed the self-inductance of lumped port in hfss? Thanks.
I use hfss to simulate inductance and Q. the frequency range is from 1GHz to 2GHz. the simulation shows that the inductance increases. :cry:why? I think the inductance should be independent of the frequency.
Hi, I have come up with a design for a 434 MHz loop antenna (23.5mm * 21.5mm) . I want to know if i lay this out in hfss , will i be able to extract the parasitic resistance, inductance of the loop and also radiation resistance. Also i want a very narrow bandwidth of about 4-6MHz. can u suggest me a tuning circuit for this. Thanks
Hi, I have come up with a design for a 434 MHz loop antenna (23.5mm * 21.5mm) . It is about 1.5mm wide and about 1 mm thick. I want to know how to lay this out in hfss , after laying it out will i be able to extract the parasitic resistance, inductance of the loop and also radiation resistance. Also i want a very narrow bandwidth of a
Hi, I have an inductor and to compute the value of the inductance I use the formula L=-1/(im(Y11)*2*pi*Freq), to compute the value of the resistance is the formula R=1/(re(Y11)*2*pi*Freq) correct? Thank you Enea
Hi , i am designing a PCB loop antenna to work at 434MHz. Will i be able to use hfss to simulate it.. Also let me know of the boundary conditions. I need to extract the rad resistance and inductance of the antenna ? Please reply. It is needed for my Thesis and I dont know about ANtenna Design. Thanks
Hi, I have layed out an loop antenna and ran a simulation sweep. I want to know how to extract the inductance of the loop antenna. I set the frequency to be solved to 434MHz(my desired frequency). I am getting a inclined straight line for the S parameter. I know that it should dip at 434MHz for it to work properly. What exitation shou
Hello Everyone, I am trying to model a 6 turn spiral inductor (rectangular) in an air box. I was wondering if anyone could have a look at it and see why I am getting no value for the structures inductance and very little resistance. Predicted Values from using other s/w / experimental: inductance at 1 MHz should be around 730 nH Resist
I want to use hfss to simulate a RF-IC spiral transformer. I have succeeded in simulating a single coil spiral inductor, and get the right inductance using the following formula: L=-1/2/pi/Freq/im(Y11) Based on this, I want to use the following formula for mutual inductance: M=-1/2/pi/Freq/im(Y12) But the results seem not quite (...)
Hi everyone! I am a newbie in both RF & hfss. Therefore, before I start performing simulation for my new design using hfss, I tried to verify my setting (in hfss) by comparing the result obtained with those of SONNET and Momentum (published in a journal paper). It's a simple problem concerning a square spiral inductor. I found out that (...)
build a box of vacuum across the 2 lines, define it as a inductance. The integration line should contact the 2 MS lines. Added after 1 minutes: The box could be just above the MS lines, and have contact with the MS lines.
Hi guys, Hope you're doing fine. I'm now working with the design of a wideband amplifier. It's operating frequency range is 3-7GHz. I'm using assura rcx for parasitic extraction. Unfortunately, I don't have the provision for extracting parasitic inductance with that tool. The amplifier has an input matching network (utilizing chebyshev network)
Hi, Is there a way to obtain partial self inductances from S-parameters?.... i am modelling a single Bondwire in hfss, however the results obtained are for the loop inductance, is there anyway i can calculate the partial self inductance of the bondwire? Is there a method of breaking the loop inductance (...)
i have 2 conductor evryone is surrounded by an insulator i want to find the mutual inductance between them and the reistance and self inductance how to put the port?? waveport or lumped poer?
Hi, Can anyone please help me for finding out the inductance between two parallel cylindrical Through Silicon Vias used for 3-D Integration using hfss? The condition is that the flow of current through the TSV is in opposit direction and the dielectric separating them is Silicon substrate.
1. You need the airbox, otherwise the pattern of fields around the inductor will be incorrect, and so will the results. 2/3. I don't like your whole probe/coax method. The probe and coax have inductance (and capacitance) of their own which gets mixed into the hfss results (S+Z parameters). So of course the results are wrong. BTW, there is no nee
Now I am using hfss to simulate a on-chip spiral inductor in a 130nm CMOS technology. I am a newer in hfss and have been confused by it for two weeks. I simulation a spiral inductor having exactly the same dimension with the inductor mentioned in the technology manuals. but the hfss simulation results is
I am a new user in hfss v.12. I would like to simulate inductive coupling between two inductance. The problem when I increased the number of turn the program gives errors. Adaptive solution setup, process hf3d error: Matrix solver exception: out of memory.. (10:22:56 mai 17, 2010) Unable to create child proc
Hi everybody ! I'm trying to learn how to use hfss, so i've read a lot of topics on this forum in order to improve my (newbie) skills :) I have to simulate a HF antenna, in order to determine it inductance... but i've some problem with the wave port (i think) and i don't know what to i need your help ! I've found some information on air
I would recommend you use the pin width. That way your model will contain the correct current profile as it approaches the device pin. Otherwise, you will lose the proper modeling of the extra inductance as the current flows from the edges of the microstrip, around the facing edges of the microstrip line (at the substrate gap) and mates with the
Hi, I am doing my first hfss simulation and seem to be stuck on a few (sadly simple) things. - Is there a way of directly inputting a surface inductance? I found the 'boundary reactance' option, but I deal with superconducting resonator circuits with extremely high quality factors, which are very sensitive to such parameters. I dont mind approxi
hfss is complete overkill to simulate a short piece of wire. There are simple equations to calculate the inductance: inductance of a Straight Wire: A Calculator inductance Calculations: Round Wire over
I am using hfss. Do you know how to setup the port? I have the hfss12 project file attached, the ground inductance is around 0.05nH. But I am not sure if the setup is right. Can you take a look and tell me what you think? Thanks
hi... how to calculate the mutual inductance between two coils, when they are placed at some fixed distance??? plz give me some guidance... Thanx in advance...:smile:
hi all i need to find the quality factor and the equivalent R,L,C of a simple waveguide cavity in hfss v11. please tell me how can i do this.
Hi there: I am sorry if this is a repeat of a common question, but I can find a way to simulate a simple straight line inductor that the results generated can be verified by empirical formula. the model is shown below and also attached to this be more specific, I use a PEC line
Superconductor also has loss at microwave frequency, which is represented by surface resistance. From this point of view, it is the same as ideal conductor. Don't forget the surface inductance of a superconductor. This has a different frequency dependence from normal conductors (skin depth δ vs. London
since you have s-parameters you should be able to get the capacitance. There's a relatively simple transformation to go from s-param to Y-param and from that capacitance (or inductance). There should be a past post in this forum that describes this. Looking at your graphs I'd expect there to be a complicated frequency dependence. I usually write
Third, there are two things you can do. 1) add an RLC boundary with the desired capacitance in series with the port and loop to cancel the loop inductance. 2) Use Designer to directly link a capacitor to the pin created by the lumped port. I think, if you use this method the S11 parameter is only valid at
Hi I have simulated cpw type inductor in hfss. The inductance value at lower frequency such .1GHz to .4GHz is around 80nH to 40nH but the value from 0.5GHz is around 6nH upto resonance. As per calculation i have designed the rectangular inductor for 7nH. But the results at lower f