Conclusion

AN4356

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Conclusion

Losing sensitivity due to EMI is not unusual, especially in handheld device such as phones

or tablets using long flex able to radiate a lot of noise.

Maintaining a low sensitivity level during reception is a key point on these applications to

ensure their qualification and to keep good reliability results.

Common mode filters are the suitable devices to guard against this issue. But they must be

chosen correctly regarding the various application constraints such as attenuation level in

the right frequency bands, frequency bandwidth, even in common mode than in differential

mode.

STMicroelectronics presents a wide range of devices dedicated to each application,

allowing adaptation to the application needs, integrating functions not supported by discrete

devices, reducing PCB surface and improving assembly costs.