Reliability Design of Printed Circuit Boards | Reliability Design of Printed Circuit Boards | 1. Reliability Design of Printed Circuit Boards | At present, electronic equipment used in various electronic equipment and systems still uses printed circuit boards as the main assembly method. Practice has proved that even if the circuit schematic is designed correctly, improper design of printed circuit boards will have an adverse effect on the reliability of electronic equipment. For example, if two thin parallel lines on the printed circuit board are very close, it will form a delay in the signal waveform and form reflected noise at the terminal of the transmission line. Therefore, when designing printed circuit boards, attention should be paid to using the correct method. || 1. Ground wire design || In electronic equipment, grounding is an important method to control interference. If grounding and shielding can be used correctly, most interference problems can be solved. The ground wire structure in electronic equipment generally includes system ground, chassis ground (shielded ground), digital ground (logic ground) and analog ground. The following points should be noted in ground design: || 1. Correctly choose single-point grounding and multi-point grounding || || In low-frequency circuits, the operating frequency of the signal is less than 1MHz, and the inductance between its wiring and devices has little effect ||, while the loop current formed by the grounding circuit has a greater impact on interference, so a single-point grounding should be used. When the signal operating frequency || is greater than 10MHz, the ground impedance becomes very large. At this time, the ground impedance should be reduced as much as possible, and multi-point grounding should be used nearby ||......
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