This is about ADL5523 0.4 - 4 GHz LNA. I have taken care of everything as you have recommended in the datasheet (operation frequency is 3.6 GHz). But when I test LNA it shows negative gain of (-10dB). I tried testing it in both modes (low input power and high input power) but the output behaves in the same way in both cases. It rises with input level but instead of gain it shows 10 dB loss.
can you mention the probable causes and how can I correct this. While testing LNA for the first time i had mistakenly run LNA with output SMA open ended? Do you think this could have caused damage to LNA IC because of the reflected output power?
Hello! Remove the capacitor 0.5 pF, connected between the input and ground, at the amplifier input.