Dear all,
I have the following simulation result that I don't understand. I have an image rejection filter followed by a mixer. The filter has IL = 0.001dB and the mixer has G =10dB and NF = 1dB. The NF I expect for the resulting system is therefore around 1dB since 1) the filter has almost no losses 2) it rejects the noise at the image frequency. However what I get is 0.018dB! I must say that I'm not able to explain how the mixer's NF does not impact on the system's NF.
Thanks for your help
Best regards
Frederic
I have the following simulation result that I don't understand. I have an image rejection filter followed by a mixer. The filter has IL = 0.001dB and the mixer has G =10dB and NF = 1dB. The NF I expect for the resulting system is therefore around 1dB since 1) the filter has almost no losses 2) it rejects the noise at the image frequency. However what I get is 0.018dB! I must say that I'm not able to explain how the mixer's NF does not impact on the system's NF.
Thanks for your help
Best regards
Frederic
Aug 14, 2009 5:44 AM