robismyname
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I would like to measure the gain of my LNA using a VNA.
I understand the concept behind:
b1 = S11a1 + S12a2
b2 = S21a1 + S22a2
S21 = forward transmission = b2/a1 = signal out of port 2/signal incident at port 1
S12 = reverse transmission = b1/a2 = signal out of port 1/signal incident at port 1
S11 = input reflection = b1/a1 = reflection at port 1/incident at port 1
S22 = output reflection = b2/a2 = reflection at port 2/ incident at port 2
What I dont understand is what ports of the VNA goes to my LNA input and what port of my VNA goes to my LNA output for S21, S11, S12, S22 measurements?
On my VNA it has:
port 1
FWD --------------->
REFL FWD------------
-
-
-
<---------------------
port 2
<-------------TRANS REV
-------------- REFL REV
-
-
-
----------------------->
So if I wanted to measure S21 (forward transmission) how would I connect my IN/OUT of my LNA to the VNA Ports 1/2?
So if I wanted to measure S11 (input reflection) how would I connect my IN/OUT of my LNA to the VNA Ports 1/2?
So if I wanted to measure S12 (reverse transmission) how would I connect my IN/OUT of my LNA to the VNA Ports 1/2?
So if I wanted to measure S22 (output reflection) how would I connect my IN/OUT of my LNA to the VNA Ports 1/2?
I understand the concept behind:
b1 = S11a1 + S12a2
b2 = S21a1 + S22a2
S21 = forward transmission = b2/a1 = signal out of port 2/signal incident at port 1
S12 = reverse transmission = b1/a2 = signal out of port 1/signal incident at port 1
S11 = input reflection = b1/a1 = reflection at port 1/incident at port 1
S22 = output reflection = b2/a2 = reflection at port 2/ incident at port 2
What I dont understand is what ports of the VNA goes to my LNA input and what port of my VNA goes to my LNA output for S21, S11, S12, S22 measurements?
On my VNA it has:
port 1
FWD --------------->
REFL FWD------------
-
-
-
<---------------------
port 2
<-------------TRANS REV
-------------- REFL REV
-
-
-
----------------------->
So if I wanted to measure S21 (forward transmission) how would I connect my IN/OUT of my LNA to the VNA Ports 1/2?
So if I wanted to measure S11 (input reflection) how would I connect my IN/OUT of my LNA to the VNA Ports 1/2?
So if I wanted to measure S12 (reverse transmission) how would I connect my IN/OUT of my LNA to the VNA Ports 1/2?
So if I wanted to measure S22 (output reflection) how would I connect my IN/OUT of my LNA to the VNA Ports 1/2?