I want to cascade LNAS to get a certain Gain，so what the problem i should pay attention？thanks
When cascading LNAs, one of the most important thing to consider is the SNR. In design we always want to achieve the best SNR possible. The way to do it is that the first stage should be optimized such that to get the best SNR for the system. You can gain up the 1st stage until the desired value is achieved. You can then gain it up with the succeeding stages to have the target gain, the SNR will not be greatly affected.
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