Since there are often a large number of electrical and magnetic interference sources at the production site, they can damage the normal operation of sensors, computers and even the entire inspection system. Therefore, anti-jamming technology is an important part of the sensor detection system. For those engaged in automatic inspection work, It is very necessary to understand anti-jamming technology.
7, multi-point grounding
Multi-point grounding is generally recommended for high frequency circuits. At high frequencies, even a small piece of ground wire will have a large impedance drop, and with the effect of distributed capacitance, it is impossible to achieve a little grounding. Therefore, a planar grounding method, that is, a multi-point grounding method can be used, and a good The conductive planar body (such as one of the multilayer circuit boards) is connected to the zero potential reference point, and the ground of each high frequency circuit is closely connected to the conductive planar body. Since the high-frequency impedance of the conductive plane body is small, the potential of each potential is basically ensured, and a bypass capacitor is added to reduce the voltage drop. Therefore, this situation uses a multi-point grounding method.
