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Here the response of the manufacturer and the simulated with ADS model I have.
My conclusions:
It was indeed possible to make it work with different matching values.
It was needed a RC feedback for stabillity
Model still differs from measurements from manufacturer
Matching is not as good as...
I think I am not clear about my question, excuse me for my english.
First step to design a matching network would be to know at wich impedance it has to be the LNA to properly work at 200MHz and in this case it seems it is not given in the datasheet.
second 20 of this video shows what I mean...
The device is supposed to work from 50MHz to 3GHz but you have to change the configuration to use it in the frequency you want. The datasheet give you the configuration for 0.9GHz and 1.9GHz. With 0.9GHz configuration it can be used for other frequencies but not for 500MHz and below, poor...
Hello,
I want to use this LNA -> **broken link removed** for a design. Datasheet shows matching for 0.9GHz but I want to use it at 200MHz.
Which procedure do you use in these cases?
I tried to measure the LNA ADS model without matching and then apply a LC matching similar to the one they...
Hello,
I have the following XnP parameters for a LNA. I want to simulate in ADS the transfer of power (S21) and the IMR3 (harmonic simulation).
I know how to simulate S param., with the data item touchstone etc. But with X param. I am never successful. Any advices?
Thank you in advance!
LNA...
Dimensions are usually given by lambda/4. There are several techniques and several antenna designs to reduce dimensions etc. But anyway TV frecuencies are lower (450-550) than GSM ones so maybe you can implement a TV antenna like the one I showed you in the photos and in the same PCB implement a...
I have found a report I made during my master degree. I attatch it to you as instructions of how to made the reduced wilkinson divider.
https://mega.nz/#!HUNxyLAR!bhZz_G6RR8z8YvjJz6Y9upSbHLEFDJwpX994kUKLjqU
PS: you could also choose a higher dielectric substrate as BigBoss said.
Because GSM antennas are usually made of porcelain patches like these ones **broken link removed**
And for TV are usually made yagui kind. Very directive and big. Like these ones https://www.amazon.com/HDTV-Fringe-Outdoor-Television-Antenna/dp/B00DHHQSB8
Luckily for you I have a interior TV...
Using metalines. By periodically capacitive loading the transmission line you can reduce its physical dimensions as well as giving it dual band functionalities.
Thank you for your answer! What we have done is reduce to order 2, increase to BW=150MHz (this has been very helpful because value varation didn't affect so much) and do a ADS optimitzation for S11 and S22.
Now losses are about 0.6dB.
It's a pitty not to have a good filtering at 315MHz but it...
Hello all,
I'm trying to implement a Chebyshev bandpass 3rd order filter at 433MHz.
Values are:
Element 1 , Orientation : series
C = 0.165 pF, L = 820.909 nH
Element 2 , Orientation : shunt
C = 365.229 pF, L = 0.37 nH
Element 3 , Orientation : series
C = 0.165 pF, L = 820.909 nH
Idealy...
If you defined the correct ports in the circuit you wanted the symbol from you could also go to the library icon in ADS schematic and there you may find the name of the circuit. Then you can drag and drop it to your schematic. Prompt saying there is no symbol would appear and then you click in...
Hello @rajesh navagare ,
For a properly filter design I think you would need 50 ohms in both ports.
Maybe a matching network is what you need.
I often use this calculator to simplify work:
**broken link removed**
You will need to know that 0.7pF are Z_c=1/jwC where w=2pif
BR
Hello @Mattylad,
polarsi 9000 does take into account the trapezoid shape. Although CAD people told me it is negligible. If I had to calculate this effect I think I would have to know the fabrication process (quimics, time of etching, etc.), right?.
I think it is negligible in front of the mask...
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