Mixer Balun Desig in ADS

Hello,
Please can somone help me to design a balun for a double balanced mixer? My mixer takes in 8GHz and put out 500MHz

Integrated or Discrete ?

Since you are working in Uwave frequencies, your balun should be made by Tlines(Distributed), you can check lange coupler and wilkinson divider topologies for distributed balun designs.

You need lange coupler to create phase difference required between outputs, and wilkinson divider to create 2 outputs with equal amplitude.

Integrated Baluns tend to have active components inside, but that is another topic of interest, mainly for IC designers.

Hope it helps.

Integrated

Thanks. Can you please put me on the path of doing it in ADS?

My Inductor Toolkit for ADS is an automated way to create RFIC inductors, and recently I added transformer/balun design also. However, that is a commercial 3rd party add-on for ADS (not free).

In ADS 2017, Keysight have added a feature "coilsys" that generates various inductor and transformer shapes. It is included with the ADS Advanced Layout license (no extra cost), so maybe you want to try that. Coilsys video: https://www.youtube.com/watch?v=nos_fjcic-Y

If you have Keysight support account, you can download Spiral_Artwork_wrk project file to benefit the parametric coils and transformers in this support project.
There are many basic coils and transformers that can be imported into your main project.
But the main problem the frequency.I don't know which process you work with but even you use high di-electric substrate , realizing this balun will occupy relatively large area due to the frequency.
If the main application is a mixer and since the operating frequency is single ( narrowband ) using a transformer will also act as a BaLUN.Trying to implement a standard Microstrip Line Balun will probabaly not work.( huge occupation area ). In order to implement a Transformer is relatively easier and a bit tricky.I cannot explain the details how to design it but I'm sure you can find tons of document on the internet.But 500MHz will also be a trouble If I were you I would use an external Balun/TransformerBut 500MHz will also be a trouble.

Thank you. I o have ADS 2017 but I don't find CoilSys.

Main Window... Tools-->Application Manager-->(Enable) Coilsys

Hello,
I want to design a Marchand balun for a double balanced diode mixer.
How do i calculate the parameters of the balun?
I am using ADS, i got familiar with linecalc but don't know what to use. MLIN, SBCLIN, ...
I need help in making the choice. I need it for a mixer that will take in 8 to 9 GHz RF and put out 400 to 500 MHz IF.

maybe it is just me, but i have NEVER gotten a Marchand balun to work

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