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.
Re: Any one familiar with FET:CGY2107,CGY2109 ,FP101,SHF-018
Thank you very much.
But just like what I said, this S2P doesnot include NF parameter.
Added after 4 minutes:
And www.ommic.com for CGY2107 CGY2109 could not be opened
It is closed or ...?
Hi dear all,
Have you ever used below FET to design LNA ?
CGY2107,CGY2109 ,FP101,SHF-0189
I want their S2P file with both S parameter and NF parameter.
But unfortunately, I could not find them any way, maybe secret ?
If any body has them, please upload, many thanks.
At past time , I had a short adapter to transform SMA to the port in the picture.
So , I just do the CAL by the adapter to SMA calKIT.
After CAL, the reference plane is about at the port on PCB.
Now I can see SMITH chart , there are only two circles from 800MHz to 2GHz.
That is what just...
Re: How to measure the characteristic impedance is 50ohm or
It seems the only way is to calculate the characteristic impedance by formula.
Fortunately, the length of the bar is about λ/8 for the frequency concerned.
So, when I just leave it open ended, the input impedance (Zin) is just -jZ0...
Re: How to measure the characteristic impedance is 50ohm or
the figures are just the JPG files uploaded above.
the inner bar is about 5mm (diameter), the outer is about 11.5mm (diameter).
So it is not same as the N type 50ohm load's diameter.
Re: How to measure the characteristic impedance is 50ohm or
Thank U for your reply.
We put a PCB (circuit board) on the fixture , and use a screw to make the board tightly connected to fixture.
The RF signal just go through the screw.
Under the screw, there is a hole which act as a outer...
Re: How to measure the characteristic impedance is 50ohm or
It seems that there is a network analyzer has a funcion called "TIME DOMAIN OPTION"
Maybe it can test S11 of any point in the DUT.
So, if some where, S11 is bad, then we can say in this point, the impedance is not continuous, i.e...
Re: How to measure the characteristic impedance is 50ohm or
Thank U all !
I will try to find some pictrue and upload it.
Added after 6 minutes:
In this case, the connector is very special, and I have no other stuff to plug in it.
So, what I can do is just left it open ended.
Recently, I met a problem that the return loss is not as good as expected.
Maybe the connector on our PCB is not 50ohm.
One port of the connector is N type, the other port is not standard type, something like coaxial cable.
And I cannot connect two connectors together to form a two N type...
using automatic tuners to measure impedance
Thank U.
VNA port1----> PA in-------->PA out------>VNA port2 (My VNA only has 2 ports)
Then, the S22 is just I want to transform to get Zout.
Am I right?
Added after 6 minutes:
But, some times, the DUT (device under test) is not PA or LNA...
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.
