source:Industry News release time:2023-03-28 Article author:yu Popular:pcb
How to reduce mutual interference between digital signals and analog signals? Before designing, you must understand the two basic principles of electromagnetic compatibility (EMC): the first principle is to minimize the area of the current ring as much as possible; the second principle is that the system only uses one reference. On the contrary, if there are two reference planes in the system, a puppet antenna may be formed (Note: the radiation size of the small puppet pole antenna is proportional to the length of the line, the current size, and frequency of the flow); If the small ring circuit returns, it may form a large circular antenna (Note: the radiation size of the small ring -shaped antenna is proportional to the circular area, the current size of the circular circuit, and the frequency of frequency). These two situations should be avoided as much as possible in design.
Some people recommend dividing the digital ground on the mixed signal circuit board from the simulation ground, so as to achieve the isolation between the digital ground and the simulation ground. Although this method is feasible, there are many potential problems, and the problems in complex large systems are particularly prominent. The most critical problem is that it cannot cross the division gap wiring. Once the split gap wiring is spanned, the electromagnetic radiation and signal string will increase sharply. The most common problem in the PCB design is that the signal line spans the division or power supply.
How to reduce mutual interference between digital signals and analog signals? Before designing, you must understand the two basic principles of electromagnetic compatibility (EMC): the first principle is to minimize the area of the current ring as much as possible; the second principle is that the system only uses one reference. On the contrary, if there are two reference planes in the system, a puppet antenna may be formed (Note: the radiation size of the small puppet pole antenna is proportional to the length of the line, the current size, and frequency of the flow); If the small ring circuit returns, it may form a large circular antenna (Note: the radiation size of the small ring -shaped antenna is proportional to the circular area, the current size of the circular circuit, and the frequency of frequency). These two situations should be avoided as much as possible in design.
Some people recommend dividing the digital ground on the mixed signal circuit board from the simulation ground, so as to achieve the isolation between the digital ground and the simulation ground. Although this method is feasible, there are many potential problems, and the problems in complex large systems are particularly prominent. The most critical problem is that it cannot cross the division gap wiring. Once the split gap wiring is spanned, the electromagnetic radiation and signal string will increase sharply. The most common problem in the PCB design is that the signal line spans the division or power supply.
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