現今消費性電子產品設計朝向高速處理器、高能源轉換效率及高傳輸速度為主要趨勢，其中電子零件為了更高速的需求，則降低工作電壓，但也因此使得系統的耐受干擾能力為之降低；另一方面，為了更佳的能源轉換效率，更換高效率的電路設計與元件，同時，也伴隨著更高的工作雜訊。 本論文針對All in one(AIO)電腦電源供應器在DC轉DC時所產生低頻雜訊傳導耦合至LAN網路，進而影響網路性能之問題為研究主題。針對此問題，我們建構一套診斷方法與分析流程，其中步驟為：一、根據ISN量測設計簡易的量測，判斷是否為系統雜訊；二、藉由切斷路徑、更換元件兩種方式以確認干擾源與干擾路徑；三、對干擾路徑實驗濾波電路。以上流程之優點可找出有效降低雜訊干擾，通過靜電測試並廣泛利用的解決方案。 The purpose of this thesis studies the affecting issue of network performance for All-in-one PC by power supply. The power supply in DC to DC produces the conduction of low-frequency noise that coupled the LAN network, and then affect network performance. The study based on a set of analysis methods and process. The research process is following below step. 1. According to the data of ISN measurement, we determined a signal from All-in-one PC whether is a noise. 2. By disconnecting circuit and replacing components, we found that the source of interference and the interference path. 3. We experiment a filter circuit to the interference path. According the above process, we identify an effective way to reduce noise, passed the static test. Finally, the way could be used extensively.
