common-mode signal absorber and equivalent circuit thereof

專利類型

發明

專利國別 (專利申請國家)

美國

專利申請案號

15/585,507

專利證號

US 10,211,496 B2

專利獲證名稱

common-mode signal absorber and equivalent circuit thereof

專利所屬機關 (申請機關)

國立臺灣大學

獲證日期

2019/02/19

技術說明

在現今的電子產品中，隨著訊號傳輸速度的增加以及尺寸微型化的趨勢，元件彼此的雜訊干擾問題日漸嚴重。差動電路系統因為其抗雜訊能力被廣泛使用在高速數位訊號傳輸上。然而，在某些情況下，差模訊號會轉為共模訊號，諸如不連續結構或是時間延遲等等。共模雜訊可能衍生嚴重的電磁干擾及射頻干擾問題，欲消除此雜訊，適當的共模抑制電路的設計便顯得相當重要。 本研究團隊提出一種吸收式共模抑制電路，能夠吸收特定頻率的共模雜訊並確保其不反射。在差模下，差模訊號能夠維持完整。在共模下，共模訊號會被吸收、損耗於本設計中。傳統的雜訊抑制器皆將雜訊反射，但其實雜訊並未消失，只是流向電路系統中其他地方，仍可能造成輻射干擾，使電磁相容測試無法通過。 本設計能完全解決此問題，在指定頻帶中，共模訊號會被吸收，以熱能形式損耗於此電路內。 Nowadays, differential signaling is a widely-used technique in delivering high-speed digital input/output (I/O) signals due to its high immunity to noise. However, some of the differential-mode (DM) signals may convert into common-mode (CM) signals. These CM signals can cause severe EMI or radio-frequency interference (RFI) problems. To eliminate these noises, a novel absorptive CM suppression circuit is proposed. This design can absorb CM signals and ensure that those signals will not reflect back to previous stages. For DM, DM signals are well-maintained. For CM, CM signals will be absorbed and attenuated in this design. Traditionally, CM suppressors totally reflect CM noise, but those noises still exist and will flow back to other places of the system. Those reflected CM noises can still cause RFI problem and make the EMC test fail. This design can totally solve this problem. CM noise is absorbed at desired frequency band, and dissipated through thermal form in the circuit.

備註

連絡單位 (專責單位/部門名稱)

產學合作總中心

連絡電話

33669945

網址