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nf1+(nf2-1)/g1
I think you should measure the power gain and the NF of the first stage with 50Ohm ports. Then you should measure output impedance of the first stage (it's output impedance of mixer1) Zout1. The NF of the second stage should be measured with the input port impedance Zin2 = Zout1...
Re: UWB-Receiver
See to get information about the UWB transceiver architecture. I understand that you want to prevent a folding upper and lower sidebands of signal spectrum. You should use image-reject method to solve a problem. Please correct me if i didn't understand your problem.
dsb nf
also you can divide the receiver chain by 2 parts:
1 - rx/tx switch, lna, mixer1 (use SSB NF)
2 - mixer2 ...(use DSB NF)
and calculate NF for each part separately (no dB, in times). total NF_tot=NF1+(NF2-1)/G1, where G1 - power gain of first stage. use 10lg(NF_tot) for convert to dB.
dsb nf
I think you can't use only SSB NF or DSB NF measurement in the overall receiver simulation, because the first mixer has SSB NF and the second mixer has DSB NF. You should try to use NF definition (NF = 10lg(SNR_in/SNR_out)), but i don't know how to do it exactly in you software.
wccheng
I think it depends on type of conversion in your receiver. Please try to check attachment file.
Terms of SSB and DSB NF are specified for mixers only. So you should just understand what mixing type you are using and then calculate NF for it.
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