Mtaching 的方法

billtest36

請問 LNA In/Out Matching 方法有哪些ㄚ?
還有 LNA to Mixer 都會有一個SAW Filter (single in differential out )Matching 方法有哪些ㄚ?
[em07]

keithen

<P>This problem is very good. I have been confused for long time. expect some experts to solve it. Here I tell about my opinion.</P><P>First let the LNA work in a fixed state. measure S11 of the LNA input. Then you can match privious circuit to LNA to transfer the most power to the LNA. But there may be some problems about NF. You can test the receiver sensitivity performance and to tune the matching circuit to get perfect sensitivity performance.</P><P>After SAW Filter there is a balanced inductor, You can tune this inductor to match SAW Filter to Mixer through testing sensitivity performance. </P><P>I think the inpedence match is more important than noise fictor. So we must use vector network analysis test the S  parameter. </P>[br]<p align=right><font color=red>+3 RD币</font></p>