| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 96 === In the high-speed and high-density digital circuits, the problem of crosstalk-noise reduction becomes one of the major signal integrity concerns. Among them, the guard traces are increasingly used to alleviate this problem as the dense interconnect layouts emerge.
In this thesis, the effect of a guard trace for the signaling transmission in a microstrip line is first analyzed from a multi-modal point of view. A multi-modal analysis allows a simple interpretation of the phenomena involved the ringing noise due to the resonance of shorting pin on a guard trace. Subsequently, the ringing-noise reduction for coupled-interconnect structures in a double-layered structure of varying dielectric constant and substrate thickness is investigated by calculating the capacitive and inductive couplings and analyzing the simulated near-end and far-end crosstalk waveforms. Additionally, the experimental results are presented to compare with and demonstrate the time-domain simulations of crosstalk reduction designs as proposed.
Furthermore, using the guard traces to avoid the coupling between the differential pairs and to improve the signal integrity of TDR and TDT responses and timing skew of differential-serpentine delay-lines is performed in this thesis. However, the characteristic impedance of differential pair is decreased after guard trace is inserted between coupled transmission line sections. The impedance compensation can be achieved by shrinking the signal trace to avoid the reflection loss owing to impedance mismatch. According to the result of eye-pattern analysis, the proper design method is proposed in this thesis.
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