![]() I need to "walk" on the resistance path -blue line- (and select A2 point as S11) OR on the imaginary part -red line- (and select A1 point as S11), which both do not make sense to me.Either the graph does not have information of S11 for a 50 Ω load (most probably?) so I need to match the impedance of 50 Ω that I have on the input to one of the drawn lines on the graph (green line) so that can I change my input impedance from 50 Ω to a known impedance and use this S parameter.Now, point A is not being crossed by any line, so my ideas to find the S11 there are: In the meanwhile I am posting my ideas since I am doing it as a homework project: My question is: How do I find the S11 parameter from this graph? ![]() Meanwhile, the absorption coefficient (A) is obtained from the relation of A 1RT. S11 is on the input side, where I have a 50 Ω source, so the input (source) is on point A. The value of S11 and S21 can be directly obtained from the vector network analyzer. For example, for the S11 I have the below figure from the datasheet. I am unsure as to how can I spot the S11 values from the Smith chart that the datasheet provides. Lets say that the input/output loads are 50 Ω. The design should be optimal for simultaneously matching impedance and maximum gain. ![]() I chose the BFP840ESDH6327XTSA1 as my RF transistor, to operate it at 10 mA, 12GHz. ![]() I am trying to understand S parameters on RF transistors. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |