weaver architecture
时间：04-07
整理：3721RD
点击：
Hi everyone,
I was wondering how noise at the image frequency would be rejected in the heartley or weaver architecture. I understand that the image will be rejected but with the noise going through 2 different path (LPF, ADCs), can we state that it will be rejected (3dB NF improvement if yes)?
Thanks for the answers
See ya
I was wondering how noise at the image frequency would be rejected in the heartley or weaver architecture. I understand that the image will be rejected but with the noise going through 2 different path (LPF, ADCs), can we state that it will be rejected (3dB NF improvement if yes)?
Thanks for the answers
See ya
The noise has to have been amplified above kTo (-174dBm/Hz) to appear as uncorrelated crap at the image frequency. And then, you wont get 3dB better noise figure you just wont get 3dB worse.