DonnyBrasko
Electrical
- Jan 2, 2004
- 1
Hi there,
I am uncertain about a S-Parameter measurement and would like to ask someone with experiences in this field.
I want to measure the S-Parameters of an random IC. For this I use a Network-Analyzer from Agilent without the S-Parameter test set.
The IC is placed on a PCB in a RF-Case with 50Ohm-SMB connectors at the ports.
The PCB is much greater than the IC, and so I have to place microstrip-lines from the connectors to th relevant pins. Because the IC is SMD, i cannot place 50Ohm microstrip lines to the IC-Pins and therefor i will get reflections from the transmission line...not good...
Normally I would say, I need a matching network to be sure to have a 50Ohm Transmission line connected to the IC Pins.
But since I have to do a reference measurement (through, short, open) to calibrate the NA, I am not sure if i really need the matching network.
So now comes the question:
Is it possible to place an optional 0Ohm resistor on the PCB to have a through, and a second one to short the transmission line, and therefor calibrate the NA with this setup? Or is it necessary to have the matching network?
I hope i could describe the problem properly.
I know this is a kind of newbie question, but i'm uncertain and i want to be sure about this.
Any help is appreciated.
Greetings
Daniel
I am uncertain about a S-Parameter measurement and would like to ask someone with experiences in this field.
I want to measure the S-Parameters of an random IC. For this I use a Network-Analyzer from Agilent without the S-Parameter test set.
The IC is placed on a PCB in a RF-Case with 50Ohm-SMB connectors at the ports.
The PCB is much greater than the IC, and so I have to place microstrip-lines from the connectors to th relevant pins. Because the IC is SMD, i cannot place 50Ohm microstrip lines to the IC-Pins and therefor i will get reflections from the transmission line...not good...
Normally I would say, I need a matching network to be sure to have a 50Ohm Transmission line connected to the IC Pins.
But since I have to do a reference measurement (through, short, open) to calibrate the NA, I am not sure if i really need the matching network.
So now comes the question:
Is it possible to place an optional 0Ohm resistor on the PCB to have a through, and a second one to short the transmission line, and therefor calibrate the NA with this setup? Or is it necessary to have the matching network?
I hope i could describe the problem properly.
I know this is a kind of newbie question, but i'm uncertain and i want to be sure about this.
Any help is appreciated.
Greetings
Daniel