RF Design-25: CPWG Based Designs in ADS

[@홍잉-o8x]

I'm also Keysight support engineer, I always appreciate your video. I cannot imagine supporting customer without your youtube channel :-)

[@BhargavaAnurag]

Good to know that and I hope you continue to leverage the tutorials....👍

[@himmalik702]

Hi I really appreciate the efforts you put in to share the thoughtful knowledge you have. Stay blessed and continue this great deed.

[@BhargavaAnurag]

So nice of you..!!

[@rjrodrig]

Thank you so much for showing how you did the multi-sections in Genesys.

[@BhargavaAnurag]

Glad it was helpful!

[@nikhilprabhatbhattiprolu7534]

Hi Anurag. I am following ur tutorials. Highly informative. Can u make a tutorial on running a Verilog-A model in ADS

[@BhargavaAnurag]

Hi Nikhil, I guess your needs will be better served if you contact your local Keysight tech support team.

[@HugePlays]

This series is amazing, thank you so much. Would you ever do a video on designing a circulator via copper instead SMT components?

[@BhargavaAnurag]

If you have any good design paper on this same then share the link and I will surely try to come up with a video if required info is available.

[@djm1688]

Hai sir, I am following your videos for the last two weeks. Such nice videos and very useful for us. Sir, can you do a video on microstrip filters especially on the hairpin and interdigital filters in ADS

[@BhargavaAnurag]

Thanks for the request. We will get there some time in near future....😊 Stay tuned and keep learning....

[@maleehakhalid3235]

Can someone tell me did he use simple rectangular tool for making the track or something from the already existing models ? Like for exciting i see mlin being used but didn't get the tool for track

[@fourierv2]

Is it possible to parameterize this so one can sweep the value for the gap/spacing, alongside the conductor widths etc, like in your 'Parametric EM Sims' video (which was microstrip) but adding CPWG format?

[@BhargavaAnurag]

It's not easy to do for all cases hence I recommend using Microstrip fundamentals and then switching to CPWG at the end of your design for final verification.

[@jonwalker8999]

Great series of videos, however why use Genesys in a demo for ADS? Why not use Linecalc or the controlled impedance line designer that are included in ADS?

[@BhargavaAnurag]

Hi Jon, Its designer's choice to use whatever he/she deems useful. Reason I used Genesys is to calculate parameters for the multi-section PD design which is not possible using LineCalc or CILD. Hope this helps.

[@kamalibrahim7322]

Thank you for so helpful videos! I'm trying to make low pass filter using CPWG, but what I noticed for the schematic version I can't see coplanar bend and coplanar tee joint! Do you know why ADS doesn't have those tow component? or maybe just I don't know how to find them! Also, my other question, can you generate a schematic from your CPWG layout that you just created here? I wonder to see what will be generated for "bend" on the schematic because as I said I can't find "Bend for CPWG". Thank you so much...

[@AnotherConcernedCitizen]

Hi Anurag, great video! I have a question about the ports. You've set only the CPW modes, and what about the microstrip line (ML) mode of GCPW? I expected one more pin under the center pin to simulate the ML mode.

[@BhargavaAnurag]

Hi Hamilton, No, you only need to provide CPW ports i.e. G-S-G port configuration. In a good CPW design most of the fields will be between coplanar grounds and signal lines, the small field between signal line and bottom ground will be taken care by simulator directly without you having to place an explicit pins there and this is how exactly it will work in your real fabricated circuits.

[@AnotherConcernedCitizen]

@@BhargavaAnurag Got it. Thank you. And the same when using the FEM solver? I mean, I just need to put G-S-G for a grounded coplanar waveguide Line?

[@soroushmoallemi774]

Like Always, Excellent Video and content. Thank you SOOO MUCH

[@BhargavaAnurag]

My pleasure!

[@Tiny_Alberto_Lee]

Thanks for your tutorial. Is there a possibility to EM optimize the layout with CPW structure in this way? I mean EM-cosim optimazing some variables? Because during the optimization, ADS will always regenerate a temp layout, it won't regenerate the ground plane automatically right? What about the CPW model in ADS? Thank you very much~

[@BhargavaAnurag]

I am not a big fan of EM optimization unless there is no other option. As I shown in the video there is no need to do so in most of the cases if you simply use basic transmission line theory and use idealistic transmission line for your design and then simply convert them to CPWG lines and complete your circuit design. If you still want to EM optimize then the technique shown here may not be used directly and you might need to use Nominal/Perturbed method by creating relevant elements.

[@faraz_24]

These tutorial are priceless👌🏻 Thank you so much 🙏🏻 We are waiting for oscillator and mixer design Can you explain how can i put a circulator in a pcb board along rf component

[@BhargavaAnurag]

Noted

[@edisonkho5874]

Here the substrate you used was for CPWG right? So how will a substrate looks like for CPW without ground under the dielectric.

[@BhargavaAnurag]

Hi Edison, You can simply remove the Cover Plate which is available by default and add a Air dielectric below your actual substrate.

[@edisonkho5874]

@@BhargavaAnurag Thank you for your reply. I tried that but the result which I obtained from hfss and ads was totally different. In my hfss design I don't have ground under the substrate. I did the same in ads but it give different results and I am not sure if my substrate design was correct in ads since I am a novice to ads.

[@gflorezn]

Great video! How many vias are necessary to put in the design?

[@BhargavaAnurag]

Hi Gidy, I am not aware of any formulas to decide that however, the important ones along the edges, and as a rule of thumb you maintain the distance to be

[@murodkurbanov2901]

Good job, thank you so much, this video is Excellent. I got all my Answers from this video.

[@BhargavaAnurag]

You are most welcome

[@jarnolohva6642]

Did you ever consider adding a CPWG as a type of Path that could be just drawn in a layout? Would make tuning your circuit just a tiny bit easier.

[@BhargavaAnurag]

Hi Jarno, Yes, this is under consideration by R&D folks but it is just that few things have higher priority....😊

[@limnasainudeen4885]

Is this same design for cpw - rf mems switch substrate?

[@BhargavaAnurag]

Hi, I couldn't get the exact question here....

[@saisathya8172]

Thanks for this informative video. How to generate the SMA component ? I was unable to grasp that concept.

[@BhargavaAnurag]

It will be covered in an another video.

[@bari179]

Thank you very much for the video! Very good explanation. Is it possible to share the final workspace?

[@BhargavaAnurag]

Do you have Keysight Knowledge Center account?

[@_santi_calvo]

This is amazing content. Thank you very much!

[@BhargavaAnurag]

Glad you liked it! Help to spread the word and share the video link with others...

[@edisonkho5874]

Thank you for your tutorial it was awesome. My doubt here is how can we a designed a substrate with only conductor and dielectric. Ie without conductor beneath a dielectric. For coplanar stripline.

[@BhargavaAnurag]

Replied to your other comment. You can simply remove Cover Plate and add a Air dielectric below your substrate and that's it...😊

[@nurulainifakhruddin4622]

Hi! Thank you so much for the video. I have one question, is it possible to do the layout-driven design of CPWG? If it is, can you show some simple example on how to do that? Thank you again.

[@BhargavaAnurag]

I thought this video is doing the thing you asked here.

[@farahbenothman6987]

Thank you verry mauch it's verry useful

[@BhargavaAnurag]

You are welcome

[@yeshwanthreddy4958]

Nice lectures sir, Please make one video on RF Receiver Budget Analysis ...

[@BhargavaAnurag]

Kindly check SystemVue playlist on my channel for RF System Analysis

[@mauriciowillig8337]

Hi! There is any tool to desing bandpass filters with CPWG? Thanks!

[@BhargavaAnurag]

I am not sure what do you mean by "any tool". BPF could be tricky to implement in CPWG depending upon what topology you want to use.

[@phonex7930]

Hi, thanks for your hard work to share the knowledge. May i ask you to help us with a tutorial about an oscillator design?!, please.

[@BhargavaAnurag]

Noted

[@ravidurbha3857]

Hi Anurag, Can you cover the design procedure of broadband Suspended Stripline power divider!!

[@BhargavaAnurag]

Will try in near future...👍

[@rfengr00]

Nice video. I thought CPWG has higher dispersion than microstrip, as the coplanar ground concentrates more of the E field in the air.

[@BhargavaAnurag]

Hi Louis, At mmW frequencies, Microstrip will have higher dispersion than CPWG. More details are available here: rogerscorp.com/blog/2020/comparing-pcbs-for-microstrip-and-grounded-coplanar-waveguide-circuits and in the reference I provided in the ppt footer that I used: www.globalcommhost.com/rogers/acs/techsupporthub/en/docs/2015_IMS_MicroApps_microstrip_vs_coplanar_John_C_final_032315_SE.pdf Hope this helps....👍

[@soroushmoallemi774]

I think creating a video about AEL programming in ADS data display would be also amazing

[@BhargavaAnurag]

Hi Soroush, What would like to do with AEL in the ADS Data Display? Kindly provide some more details so that I can offer suitable comments....

[@edisonkho5874]

How should I design substrate for coplanar strip line ( cps line) without ground under the dielectric In ADS. With only Air, PEC and Roger 5880 with thickness 0.508mm. Can you please make a video of it.

[@BhargavaAnurag]

I don't think it need a totally new video, simply remove the cover plate from the bottom and do your calculations in the LineCalc accordingly to convert a Microstrip circuit to a CPW one like shown in this CPWG video

[@alterguy4327]

Hi, I have been using Cadence for Circuit Design, is it worth to shift to ADS, is there any companies in India who are using ADS

[@BhargavaAnurag]

I am not sure what kind of circuits you are designing so it difficult to comment between Cadence and ADS but yes, there are tons of companies in India using ADS...😊

[@alterguy4327]

@@BhargavaAnurag Thankyou