In recent year, the single-end transmission line is instead by differential transmission line . Differential signaling has been generally used in the high speed digital interconnection on the PCBs. The advantages of the differential signal with a low noise and high common-mode noise suppression, but the differential mode transmission signal is a very high quality requirements of circuit, the two line should have same length and symmetry, but in the practical package the circuit is not this case, In the limit space ,the differential signal should through the bend, it would lead to the phase skew and produce the differential to common mode conversion noise on the signal integrity and electromagnetic interference(EMI) problem.
In this paper a new type of bend is proposed that reduces differential -to-common mode conversion noise for high speed digital circuit. This novel structure can reduce the mode conversion over 20dB at DC to 10GHz, and the differential insertion loss remains low. Also time domain the TDT common mode noise from 0.09V to 0.008V as compared with the bended differential transmission line using the edge couple bend. Moreover, the measurement on proposed structure show a close match with the full-wave simulation result. However, this structure does not have a reference plane, the return path is not complete, the current is easy to radiate out, so I design a guard trace to reduce the radiation in this structure.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0731112-172822 |
| Date | 31 July 2012 |
| Creators | Hsu, Chia-Hsang |
| Contributors | Ken-Huang Lin, Chih-Wen Kuo, Chieh-Ying Li, Ming-Cheng Liang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731112-172822 |
| Rights | user_define, Copyright information available at source archive |
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