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Impedance matching

Shanci Hu

Here is my question,

I know that I have to do impedance matching between stages like LNA and mixer, but is there any rule that I can decide where I should do matching and where I don't need to? Maybe the maximum power transfer theorem could work, but is it applicable to cascode because cascode can be viewed as CS and CG cascaded.

BUT it seems that we don't do matching between them while their impedance do not naturally match.

  • StephanWeber

    Hi, to decide if you need a matching network or not you should check if you achieved what you want or not. E.g. with a matching network you might be able to improve on power gain or noise figure. However, sometimes you are already good enough, and more gain would only increase the risk for bad stability or too narrow bandwidth. And optimizing for maximum power gain might be not the optimum regarding power or power efficiency.

    Bye Stephan

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