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Hi all, Having looked at a few designs for LNA's I reckon it would be worth creating something based off of AN-MWO-LNA-XBND-2020.2.6.pdf in the files section. WG15 input, rather than WG16 so optimum

Hi Paul, good idea regarding the LNA. It's probably a good idea to start out with a single stage design to make sure that the performance of the FET is good enough on 8GHz. If it ends up being okay

Hi Paul, Endorse the suggested way forward- several building blocks here that can be worked on separately, WG port, matching section, bias arrangement, gate/drain bias supplies etc. I've always

Hi Robert, Thanks for the response. I'll have a go with Genesys over the weekend to see if I can replicate the WG input / impedance transformer of the F1OPA design at 10.36GHz first. I guess

Hi Robert, I've used both KiCad and Eagle for RF microstrip circuits in the past. Even though KiCad is slowly catching up with basic microstrip functionality Eagle still has much better support for

Hi Arved, No problem - previous Eagle user here, but migrated to KiCad for >2 layers and larger boards. Getting a bit OT, but likewise I've done some microstrip layouts in KiCad using custom

Hi, i am very happy to see we will finally have a "universal" lna/downconverter for X band. A lot of amateurs will benifit from your design. (The final design) Keep up the good work guys! Jean-Luc

Morning all, I did learn over the weekend that doing anything sensible in Genesys is a nightmare on wheels. Basic bandpass filtering with microstrip coupled lines is fairly straight forward, but

Morning Paul, Not had huge amount of free time to look at things, but one thing I did spot is that not all of the .s2p files have noise parameters - a smaller list of Fmin and Gamma opt at the end of

Afternoon Paul, Robert fyi, loading in s2p files and plotting Nopt is possible using open source tools --> Qucs. Basically the only thing Qucs is missing for this is a decent tuner to change values

Hi, I agree it makes most sense to use this FET. It is used in several designs. I purchased a couple of them and of the CE3514M4 which is often used as a second stage for example

Hi Ph4as , regarding the first link you provided. I contacted the guy two or three times last year, he was not intetested to sell his PCB because he said the LNA oscillates a lot. I also think these

Hi Chaps, All excellent info. Could one of you simulate the CE3512K2 to see where the best noise figure is vs input impedance please. The F1OPA LNA uses RO4003C PCB with a thickness of 0.305 mm. I

That looks like great work Job! My internet searching hadn't turned up your xConv work. Looks like you've got 90% of what we're aiming at.? Certainly nice to have a reproducible "reference

Hi, we tried some years ago a design with this FET as you said. Stefan simulated the whole signal chain in Agilent ADS and it looked promising. But we never get rid of the oscillations of the first

Putting my money where my mouth is: I quickly simulated the source stab circle, s11 and Nopt for 8.5 GHz using the 2V_10mA.s2p file in Qucs [image: afbeelding.png] [email protected]> wrote:

Hi Sebastian, Thanks for the additional info. I wasn't aware of this. For the xconv design, the LNA parts was done in ADS en then transferred to Eagle directly? I saw only the Gerber result is

Hi all, Good to see the general mobility in the direction of X-Band converters. As Sebastian has already hinted, I haven't managed to make design I made and fabricated back in 2018 work completely:

Hi Stefan, Thanks for posting this material and the additional explanations. I have no idea what could cause this as my experience is almost non-existent. Do I understand correctly that these

Hi Job, Yes, that assumption about oscillations is correct. However, back then I also did extensive experiments with different housings, absorber material placements, shielding etc - all to no