手持式导航仪电源EMI设计

DC-DC Converter's EMI Design in PNA

由于地面GPS信号非常微弱(EIPR约为-130dBm),机内电磁干扰(EMI)对手持式GPS导航仪接收性能的影响非常大。在以手持式导航产品为研究对象,分析其电磁干扰产生的原因时,我们发现手持导航仪各电源模块良好的EMI设计至为关键。掌握电源EMI设计的基本原理,合理布局各电源模块,即能有效降低机内EMI干扰,提高整机GPS接收性能。

Electro-magnetic interference （EMI） in PNAs （Portable Navigation Devices） affects their GPS performance seriously, for GPS signal is so weak on earth （EIPR is about -130 dBm）. When approaching to solve EMI problems, we find it＇s especially important in designing every power module （DC-DC converter）. With correct DC-DC designing principle, taking care of power module＇s layout, we can prodigiously decrease the EMI and get a good GPS receiver.