ESD and EMI interference in mobile phones
This article briefly explores the causes and consequences of EMI in mobile audio systems. The use of ESD interference suppressors and EMI filters was then discussed to avoid these threats. Finally, the current three solutions are compared.
Modern materials and technologies cause electrostatic discharge (ESD) and electromagnetic interference (EMI) and are a constant risk. Our wearing and our contact items can cause electrostatic discharge. Digital technology has electromagnetic interference. Electrostatic discharge can damage electronic components in your phone. The phone is easy to replace, but it hurts the user a lot. Cell phone circuit designers must ensure that the necessary steps are taken to eliminate ESD damage.
If there is electromagnetic interference (EMI) in the audio circuit, sounds such as 嘶嘶, 噼啪, 嗡嗡, etc. may occur, and the sound quality is poor. Mobile phone users cannot tolerate such interference. Therefore, it is necessary to try to filter the electromagnetic interference of the audio circuit.
Electrostatic discharge - causes, results and inhibition
cause
Almost everyone has experienced the effects of static currents. When we were cavemen of the prehistoric Stone Age, we have seen it in lightning. Of course, it is still a major threat today, everywhere. Using a plastic comb to comb the head, you can see the generation of static charge. Put your arm close to the screen of the TV and you will see the hair on your arm stand up. This is also an electrostatic effect.
When you open the door and walk out of your car, you may feel a shock, which comes from electrostatic discharge. With more and more electrical equipment at home and at work, static electricity is a constant danger. People who manufacture or repair electrical equipment protect themselves and the equipment they use, and they connect themselves to the equipment to avoid damage from electrostatic discharge from electrical equipment.
in conclusion
We can see lightning striking buildings and trees, which are destructive. If the ESD protection of electronic circuits is not optimal, even a small discharge will destroy sensitive electronic circuits, which has been detected. The phone has a certain ESD protection. The external connection of the audio circuit is the most common source of ESD. Simply plug in the headphones and amplifier, which may mean that the phone will be affected by ESD.
As shown in Figure 1, what happens when an electronic component is affected by ESD? A fine hole is created and the oxide will invade the component.