![]() 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? S11 is on the input side, where I have a 50 Ω source, so the input (source) is on point A. 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.
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