Enriching multimedia services has pushed the resolution of LCD displays and cameras in 3G mobile phones to a new level. However, the interface design that connects the display and camera modules to the baseband circuitry or multimedia processor will face more serious ESD and EMI issues. The solution from STMicroelectronics (ST) discussed below will help solve this problem.
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Enriching multimedia services has pushed the resolution of LCD displays and cameras in 3G mobile phones to a new level. However, the interface design that connects the display and camera modules to the baseband circuitry or multimedia processor will face more serious ESD and EMI issues. The solution from STMicroelectronics (ST) discussed below will help solve this problem.
To address these issues, some display manufacturers, semiconductor manufacturers, and camera module manufacturers have developed high-speed serial totals to help design engineers free themselves from the cumbersome parallel bus design.
Selecting a TVS diode based on the signal transmission speed of the serial bus is one of the keys to designing an efficient ESD protection function. Basically, the higher the data transfer rate of the signal, the lower the capacitance of the ESD protection diode is required. Therefore, the interference generated by the protection component on the current signal must be minimized. This is directly related to the parasitic capacitance of the TVS diode.
Differential capacitance equalization between two data lines is another feature that designers must consider. As a result, designers can design extremely similar components for data lines with very small capacitance parameters. This is a very significant advantage of silicon diodes because the varistor has a capacitance deviation of approximately 10% to 20%.
In some cases, the ESD problem is not the only problem that engineers have to solve. Because many electronic components are exposed to RF radiation when the mobile phone transmits and transmits RF signals, RF radiation must be suppressed to protect normal operation. Even in some cases, some ICs themselves generate RF radiation as well as RF interference.
LCD or camera modules are susceptible to pulse attacks, producing audible noise or visible screen jitter. This is why EMI filters are highly recommended when designing mobile phones. In a sense, EMI radiation suppression has become a key issue for next-generation mobile phones such as multi-band phones or 3G phones, as existing solutions are reaching technical limits.
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