Method for suppressing crosstalk of high-speed signal line based on electromagnetic field mode decomposition
A high-speed signal and mode decomposition technology, applied in the fields of electromagnetic field characteristics and complex mathematical operations, it can solve the problems of complex signal line coupling mechanism and inability to provide high operating frequency, and achieve the effect of reducing bit error rate and crosstalk.
Active Publication Date: 2015-08-19
ZHEJIANG UNIV
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Problems solved by technology
Due to the increase of the operating frequency of the circuit board, the coupling mechanism between the signal lines becomes more complicated, and the crosstalk problem must be analyzed from the perspective of the lowest electromagnetic wave propagation, and the circuit analysis method based on voltage-current cannot provide a solution for high operating frequency Program
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[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0035] The present invention starts from the most basic transmission line equation and analyzes the causes of electromagnetic crosstalk. The specific principles are as follows:
[0036] N+1 signal lines with long distance and parallel wiring can be equivalent to figure 1 For the multi-conductor transmission line shown, the voltage and current on each signal line (single-ended voltage and current) satisfy the following transmission line equation:
[0037] ∂ V ( z ) ∂ z = - [ Z ] I ( z ) - - - ( 1 )...
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The invention discloses a method for suppressing crosstalk of a high-speed signal line based on electromagnetic field mode decomposition. An input end of the high-speed signal line is added with a voltage encoder (transformational matrix), so that the voltage encoder outputs modal voltage. An output end is added with a voltage decoder (transformational matrix), so that the voltage decoder restores and outputs single-ended signal voltage, so as to achieve objectives of reducing crosstalk when the high-speed signal line performs long-distance parallel transmission. The modal voltage is used to replace conventional single-ended signal voltage, and the modal voltage is used as carrier in signal long-distance transmission. The transformational matrix is used to perform diagonalization on an impedance matrix and an admittance matrix in the high-speed signal line. The method can greatly reduce bit error rate of signals and crosstalk in the high-speed signal line, and improves communication capacity. The method can be applied for high-speed high-density signal line wiring in printed circuit boards, packaging, and chips.
Description
technical field [0001] The invention relates to a crosstalk suppression method, in particular to a high-speed signal line crosstalk suppression method based on electromagnetic field mode decomposition. Background technique [0002] Crosstalk is one of the most important factors affecting high-speed signal transmission on a circuit board. When multiple high-speed signals are transmitted on the circuit board at the same time, due to electromagnetic coupling, different signal lines will affect each other. The specific performance is that the interference voltage coupled from other signal lines is superimposed on the useful signal. This interference voltage can lead to data loss and bit errors. The industry mainly includes two indicators for measuring crosstalk on circuit boards: near-end crosstalk (NEXT) and far-end crosstalk (FEXT). Near-end crosstalk refers to the coupling of the signal transmitted by the interfering signal line at the transmitting end to the transmitting e...
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IPC IPC(8): G01R29/08G06F17/16
Inventor 魏兴昌舒余飞
Owner ZHEJIANG UNIV