EMC Solution for GTS/VCT

Why This Solution Matters

For GTS/VCT rugged laptops and i/W rugged tablets, customer-specific customization such as isolated power modules, new interfaces, expansion boards, or power architecture changes can significantly affect CE102 and RE102 performance. Rather than relying on trial-and-error, our engineering approach identifies noise sources scientifically and implements targeted mitigation measures.

For example:

It can be seen that there is a high exceedance at the frequency of 265K, and spikes appear in the 2-10M range. In general, the situation with RE102 is not very good. As expected, RE102 is also not qualified. Let's take a look at the initial test spectrum:

After increasing the capacitance, we tested CE102 and we can see that 265K has been suppressed to meet the requirements.

Retesting RE102, the results were surprising: the entire over limit band of 20-22MHz disappeared, and all frequency points were more than 8dB below the limit, with ample margin.

Engineering Methodology

1. Identify conducted emission sources through switching-frequency correlation.
2. Optimize differential-mode filtering with impedance-matched X capacitors and input filters.
3. Analyze harmonic distribution to locate radiated emission origins.
4. Suppress common-mode current using Y capacitors, optimized return paths, and shielding.
5. Verify improvements through iterative laboratory validation.

Applicable Product Families

• GTS Series Rugged Laptops
• VCT Series Rugged Laptops
• i/W Series Rugged Tablets

Key Design Principles

Conclusion

By integrating EMC-oriented design methodology into platform development, Global Tech enables cost-effective customization while maintaining military-grade reliability, reducing repeated laboratory testing and accelerating customer delivery.