Noise interference from power supply

Copy original PCB Board scheme drawing and modify it to reduce noise interference from power supply, this is a reverse engineering process through which the original printed circuit card schematic diagram and layout file/gerber file will be restored;

Radio frequency PCB card circuits are quite sensitive to power noise, especially to glitch voltage and other high frequency harmonics.

Microcontrollers will suddenly draw most of the current for a short period of time within each internal clock cycle. This is because modern microcontrollers are manufactured using CMOS technology. Therefore, assuming a microcontroller is running at an internal clock frequency of 1MHz, it will draw current from the power supply at this frequency.

If proper power supply decoupling is not taken, it will inevitably cause voltage glitches on the power line. If these voltage glitches reach the power supply pins of the RF part of the circuit, they may cause work failure in severe cases.