To compensate for PCB IR losses, all of the ADC and DAC voltage rails need to properly utilize the sense features of their respective regulators, as listed below:
•ADC_AVCC
•DAC_AVCC
•ADC_AVCCAUX
•DAC_AVCCAUX
•DAC_AVTT
•VCCINT_AMS
Sense line connections should not use a dedicated spy hole pin on the RFSoC, because all power supply pins should be fully utilized and connected to their respective planes. Instead, a "Force" solution should be utilized, as shown in This Figure.
Notes related to This Figure:
•RPDN: Power distribution network resistance (PCB parasitics).
•RSENSE: Discrete 2 mW precision sense resistor.
•RPRTC: Discrete 10W regulator protection resistor.