Electromagnetic compatibility (EMC) is vital for linear adapters to ensure they do not interfere with other electronic devices and can operate properly in the presence of external electromagnetic interference. There are several key design methods to achieve EMC.

　　Component selection is the first step. Components with good electromagnetic properties are chosen. For example, low - noise power transistors and capacitors with stable dielectric properties are preferred. Shielded components can also reduce electromagnetic radiation. Ferrite beads are often used to suppress high - frequency noise in the power supply lines. They act as high - impedance elements at high frequencies, effectively blocking the passage of unwanted high - frequency signals.

　　Circuit layout design plays a crucial role. Properly arranging the components on the printed circuit board (PCB) can minimize electromagnetic interference. Power and signal lines should be separated to avoid crosstalk. Signal traces should be kept as short as possible to reduce radiation. Ground planes are used to provide a low - impedance return path for signals, which helps in reducing electromagnetic emissions. Differential signaling can also be employed, where two complementary signals are transmitted on a pair of wires. This technique cancels out common - mode noise, improving the signal integrity and reducing electromagnetic radiation.

　　Shielding is another important method. The adapter casing can be designed as a shield, using conductive materials such as metal or conductive plastics. The shield is connected to the ground to form a Faraday cage, which blocks external electromagnetic fields from entering the adapter and also prevents the adapter's internal electromagnetic emissions from interfering with other devices. In addition, internal shielding structures can be added around sensitive components or circuits to further enhance the EMC performance.

　　Filter design is essential for EMC. Input and output filters are designed to remove unwanted electromagnetic frequencies. Low - pass filters are commonly used in power adapters to block high - frequency noise from entering or leaving the adapter. These filters are composed of inductors and capacitors, which are carefully selected and configured according to the adapter's operating frequency and power requirements.

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