Junior Member level 2
in designing down converter mixer, how to determine RF input power needed? Most of designing circuit they chose -30dB.
thank you. For example if rf -30dB and LO 0 dB, is it Ok? or find out the maximum LO power from voltage conversion vs LO signal power then only adjust RF power base on LO power?For the mixer to work properly, the LO signal must be the largest signal in the mixer.
A typical rule of thumb is that the LO should be 30 dB higher than the RF. The actual level is determined by your linearity requirement, but 30 dB is good starting point.