I want to construct an autonomous RF PCB module powered by a solar panel. To achieve this, I have obtained solar harvester and battery charger integrated circuits (ICs) designed to charge a Li-Po battery with a voltage of 4.1 V. Following this, my intention is to establish a connection between the power section and the RF/microcontroller (MCU) section.
To mitigate potential noise issues, it has been suggested to use a low dropout regulator (LDO.) The drawback of LDO lies in its lower efficiency compared to switching mode regulators, particularly concerning thermal power losses. This becomes especially critical in the context of solar autonomous power, where efficiency is a key consideration.
Upon my understanding, the primary source of noise is the electromagnetic interference (EMI/EMF) generated by the high frequency of the switching mode regulator. To address this, I am contemplating splitting the entire project into two distinct parts. The first part would encompass the power components, including the harvester charger, battery, and a switching mode regulator providing a 3.3 V output. The second part would involve the RF/MCU components. Power would then be transmitted from the power PCB to the RF section using wires with a length of 10-30cm. This approach is aimed at creating sufficient distance between the switching mode and the RF components to prevent EMI.
I seek your advice on whether this approach would effectively solve the noise problem, or if using an LDO remains the optimal solution.