hhnn
Junior Member level 2
Hi all,
My LNA design has differential input and output : GSSG. But the problem is our system can't measure NF and S-parameters for differential input and output. So I connect the off-chip baluns at the output and input of the LNA, then measure the total performance of the balun+lna+balun.
Next I connect the 2 balun together, and measure the performance of the 2 balun.
My problem is that after getting the S-parameters of the 2 baluns together, I don't know how to de-embed the performance of 1 balun alone.
I know that we can transform S parameters to T-parameters and use this formula: T(2balun)=T(1balun)*T(1balun) to find the T-parameters of 1 balun.
But square root of a complex matrix will give 4 results and I don't know which one to choose.
IS there any other ways to de-embed the S-parameters?
Million of thank.
My LNA design has differential input and output : GSSG. But the problem is our system can't measure NF and S-parameters for differential input and output. So I connect the off-chip baluns at the output and input of the LNA, then measure the total performance of the balun+lna+balun.
Next I connect the 2 balun together, and measure the performance of the 2 balun.
My problem is that after getting the S-parameters of the 2 baluns together, I don't know how to de-embed the performance of 1 balun alone.
I know that we can transform S parameters to T-parameters and use this formula: T(2balun)=T(1balun)*T(1balun) to find the T-parameters of 1 balun.
But square root of a complex matrix will give 4 results and I don't know which one to choose.
IS there any other ways to de-embed the S-parameters?
Million of thank.