Power supply noise is a common problem on high-frequency PCBs . This interference is usually caused by electromagnetic fields generated when current flows across the PCB. Electromagnetic fields are generated when current flows through power or ground lines on the PCB. If these fields interact with other components on the PCB, they can produce noise, thus affecting circuit performance.
There are many sources of power supply noise. Poor power and ground line design, such as excessively narrow or long lines, can increase impedance and generate noise. Closely spaced components can create coupling effects, further increasing noise. Certain high-speed switching circuits can also produce significant current noise.
Power supply noise can propagate through power lines or shared ground lines into other circuits, causing signal interference and distortion. This can lead to circuit logic errors, delays, or malfunctions, thus affecting circuit performance. High-frequency noise can cause clock signal jitter, which affects circuit stability and performance. Clock signals are critical for the proper functioning of many digital circuits; therefore, any form of jitter can cause problems.
Power supply noise can reduce the sensitivity of electronic components, thus affecting circuit performance. This can lead to reduced signal amplitude and increased noise, further impacting the accuracy and reliability of the circuit. Power supply noise can also affect the accuracy of measuring instruments, causing errors in measurement results. In applications requiring high-precision measurements, this can become a serious problem.
In some cases, power supply noise can trigger logic errors within a chip. This may be due to power supply noise caused by state transitions of certain transistors within the chip, while other logic circuits are in the process of level transitions (indeterminate states). High-frequency noise in the power distribution system, if not effectively filtered out, can wander throughout the power network, causing serious electromagnetic interference (EMI) problems. This not only affects the normal operation of other chips on the same power supply but can also negatively impact other devices or systems through radiation and conduction.
Components subjected to prolonged power supply noise may experience aging and damage. The unique characteristics of these components are also reflected in the device’s RF fingerprint. In power systems, power supply noise caused by electromagnetic interference can affect the normal operation of relay protection. For example, when electromagnetic interference affects analog circuits, it can worsen the signal-to-noise ratio of signal transmission, and in severe cases, even cause the transmitted signal to be overwhelmed by noise; when it affects digital circuits, it can cause errors in logic relationships.
At KKPCB, we specialize in manufacturing high-frequency and RF PCBs using advanced materials such as Rogers, delivering exceptional signal integrity, low dielectric loss, and maximum reliability. Our expertise covers microwave, 5G, satellite, automotive radar, and IoT applications, providing customers with tailored solutions that meet the most demanding performance requirements. With state-of-the-art processes, strict quality control, and fast, cost-effective production, we empower you to bring next-generation technologies to market with confidence and efficiency.
