saulbit
Member level 4
I have thought such a simple application for several days. In a downconverter system, take the LO frequency is 3500MHz for example, and the IF is 600MHz, then if there is no prefliter in the rf path, how can I determine the rf is 2900MHz or 4100MHz? In the mathmatical process, such two rf signal have different phase by the LO frequency. Can I pick the phase information out so I can determine the rf frequency without a image-frequency filter?