I have an LNA and I would like to measure its gain parameter. However, I don't have a spectrum analyzer. Is this possible with a signal generator and a power meter or a VNA.
yes this is possible. You need to calibrate the equipment without the LNA, then insert it, and then measure the difference in output signal.
Be careful to NOT saturate the LNA. I recommend that the input signal be 10 dB (or more) below the input one-dB compression. Good question, and good luck!
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