Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Hello to all. I had the filter tested on a separate location and found no problems at all.... I checked the amplifier with other parts in the same range....My suspicion was correct. Amplifier was behaving..problem solved....thank you very very much for your comments!!
I suspect it may be something beyond the filter. I think the amplifier I am using to test it is not behaving properly.
I have no way to prove this because I don't have another amplifier in that range. But I think the filter itself should not have a problem.
The reflection happens right away...
The max power I am looking is around 40W.... But I can start with 10 and work my way up. In the VNA across the entire band, my vswr is at least 1.5 to 1. Now, I know that small vs large signal behave differently, but I can't figure out why the power is reflecting. You mention calculation of...
Hello everyone.
I seem to be facing an interesting problem.
I have an S-Band highpass filter made with microstrip.
It requires to take some power, 10+ W.
The filter itself came out pretty smooth, the shorted resonator lines have an approximate impedance of about 80 ohms and vias of about 16 mil...
Good day.
I have made a couple of PIM tests in my workarea.
Most of them have been successful. Some had issues that were later resolved.
The 64000 question here is:
How do I prove these results? Say, like a datasheet?
I can see that it's passing and I would just put a pass fail response.
But...
biff44... I did try that too. It worked ok.
I got some differential amplifiers to make the matching possible.
I was able to get the results I needed.
Thank you everyone for your help.
I think I have something to work with.
So I will be using the AD8351 to go from single ended to differential.
After that I will attach an attenuator that converts 150 ohm to 200 ohm,
which I think it shouldn't be a big deal except for the chip resistors limitation is bandwidth if there's any...
If I were to use this differential amplifier or any other in the single ended configuration,
I would only need to ground the INN or the OUTN connections and feed the signal in or out of the system from the INP or OUTP connections, correct?
Or is there something else to look into before using it...
I thought about using the attenuator option as a last resort. But I guess I have no choice if I can't find anything else.
I was also thinking of using opamps, but they don't go up in frequency very much, do they?
Do you know of any other manufacturer that builds this kind of amplifiers?
As...
Biff44, that's pretty much what I need. vswr measurement*I already took care of. The current setup where I use transformers provides all the passband parameters I need. It's the transmission part in higher frequency that is causing me issues. That's why I am trying to figure out what...
Hello,
I have a situation in hand.
I need to test a differential device in a network analyzer.
I have used transformers and baluns,
but they are limited in bandwidth.
I did some research and some advice I received and
a suggestion was to use a differential amplifier for both input and output...
Hello there.
I have a question about impedance matching when you have a balanced connection.
I have this network that has two balanced outputs that have 100 ohms each.
I want to bring it to 50 ohm unbalanced impedance.
The frequency of operation is between 200 and 400 MHz.
Now, the most...
My apologies. When I wrote this post I was half asleep and my mind was somewhere else.
My intention is to build a filter that can keep a bandwidth as constant as possible.
The topology is using shunt LC resonators coupled with capacitors.
Thus, the series varactors.
As the frequency goes up...
Good day.
I am working on an assembly that uses varactors connected in series on the transmission line.
They are there for the purpose of keeping a fixed bandwidth.
But it seems that they are not staying on because
the bandwidth changes as the voltage increases.
Is this even possible?
Either...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
