| 摘要: | 本論文主要針對車用GPS外接式主動天線應用於汽車內部裝置之無線電及EMC
干擾改善研究
其中主動電路架構包含主動元件放大器,和被動元件filter之結合,應用於改善EMC干擾情形,此主動天線整體架構為一陶瓷天線,位於FR4 PCB上方,射頻電路設計於FR4 PCB板下方,並以市售衛星導航接收機驗證訊號EMC改善前後之C/N雜訊比改善情形,一般汽車電子受到多方面的影響，包括惡劣的環境，高可靠性的要求，以及對成本的高度敏感性。汽車內部的電路面臨很多環境問題，包括電源衝擊、無線電干擾（均包括去和來兩個方向的附近的或者車內的無線電發射和接收設備），靜電放電，以及電源線上的電場和磁場。本論文設計於天線饋入點先設計一濾波器降低低頻雜訊干擾,再於第一級放大器與第二級放大器間置入一濾波器,最後再於第二級放大器與GPS IC 模組間置入一濾波器,加強EMI抗干擾能力.
This thesis for car GPS external active antenna used in automotive internal device EMC interference Improvement Study
the active circuit architecture contains the amplifier of the active components and passive components filter combination applied to improve EMC interference situation ,This active antenna overall architecture of a ceramic antenna, located above the FR4 PCB, RF circuit design below FR4 PCB ,commercially available satellite navigation receiver verification signal EMC improve before and after C / N noise than improve the situation, the general automotive electronics subject to a wide range of effects, including harsh environments, high reliability requirements, and the high sensitivity of cost. The automotive internal circuit face many environmental problems, including a power surge, the radio interference (including of the two directions of the car radio transmitting and receiving device), an electrostatic discharge, as well as the electric and magnetic fields of the power line. This thesis in the antenna feed point to design a filter to reduce low-frequency noise interference, and then placed one filter between the first amplifier and the second amplifier ,and finally in the second stage amplifier with GPS IC module placed in a filter to enhance EMC immunity. |
