Category: Hardware
Product Number: ADF5901
In the design of the FMCW radar using ADF5901 and ADF4159, a high-frequency signal at 300 kHz is observed on Vt. This phenomenon was present in previous designs as well. Upon inspection, it was found that only pins 14 (AVDD, RF_AHI) of ADF5901 were missing filter capacitors. However, even with these capacitors removed from the previously functional radar board, it continued to operate normally. Therefore, I would like to inquire about the cause of this issue. Is it related to the filter capacitors? The loop filtering and configuration codes have been verified for feasibility in previous designs, and there are no differences in these aspects.
