question about S21 S22 in LNA
时间：04-08
整理：3721RD
点击：
Hi, everyone.
This is my first time trying to design a wideband LNA from 3.1G~ 10.6G Hz. Up to now, i have a current mirror and a cascaded circuit with feedback circuit. I played around with the current , and don't understand why S22 is changing when i varied the current?
second question is, i cant get desirable S22 which i want it to be below -10db , and S21 , somehow, is a negative number.
can anyone answer my question.
THanks
This is my first time trying to design a wideband LNA from 3.1G~ 10.6G Hz. Up to now, i have a current mirror and a cascaded circuit with feedback circuit. I played around with the current , and don't understand why S22 is changing when i varied the current?
second question is, i cant get desirable S22 which i want it to be below -10db , and S21 , somehow, is a negative number.
can anyone answer my question.
THanks
check following links for your problem
S11 and S21 parameters for LNA design
https://www.edaboard.com/ftopic370743.html
Low-Noise Amplifier Stability Concept to Practical Considerations
http://www.maxim-ic.com/app-notes/index.mvp/id/1851
what is the importance of S22 in an LNA?
https://www.edaboard.com/ftopic264613.html
how to broaden peaks of s11 and s22 in lna design
https://www.edaboard.com/ftopic399885.html