Hi,
Thanks for your response. I am using this amplitude measurement only. But as I want to measure the actual input (which is at the input of LNA, which is unknown to me) . Due to LNA, fix gain is being added to the actual input. So, Before measuring the amplitude using I and Q, I need to add digital gain compensation , right?
This digital gain compensation will add Loss equivalent to gain of LNA. and then when I measure the amplitude, I will get the actual amplitude using I,Q.
So, my question is to add fixed loss( equivalent to LNA gain) to I,Q to compensate for the External LNA gain, what are the suitable implementation technique?