Regarding the question about ADF5904, I mainly focus on the relationship between the frequencies of the LO and RF ends. I hope to use the 24Ghz LO input, and the RF end accepts 24Ghz unmodulated radar signals. The main problem is that if the Doppler benefit is calculated, the RF end frequency may be lower than the LO end when redshift occurs. Regarding this, I did not find relevant information in the manual. Google told me that Mixer can be classified as High-side and low-side Some Mixers support the above two modes at the same time. I want to know two things. 1. is the type of Mixer built into ADF5904. 2. It is my personal doubt. When the RF frequency is lower than the LO, what is the output behavior of the Mixer; is the output phase changed or not?