I designed a schematic by using AD8332 for Automatic gain control. In my card i am not able to achieve the gain of 0 do 48 dB by this IC. Instead i am getting 5 dB overall loss.
I have followed the same which is mentioned in evaluation board of AD8332.
I was trying to do Ltspice simulation for This IC. I got the '.cir' file from here and i created a symbol. i have uploaded the design file here.
In this simulation at LNA output i m getting mentioned 13 dB gain at single ended line but VGA is not giving required output instead it is giving the constant voltage.
i have used the 70MHz signal as input with 0.001 volt as input.
kindly resolve the issue why the VGA is not giving 70MHz output ?