Non-Crosstalk Scheme Based on Linear Combination Transformation in High-Speed Interconnects

Abstract

Aiming at the problem of crosstalk in high-speed interconnects, a non-crosstalk scheme based on coupled transmission lines-channel transmission matrix (CTL-CTM) is proposed. In this scheme, the transmitted signals are linear combination transformed at the transmitting end of the interconnect lines where the transmission signals among the interconnect lines constitute an orthogonal mode. After the signals have synchronously transmitted to the receiving end, second linear combination transformation is performed to restore the transmitted signals. Simulation results show that this low cost circuit proposed is capable of improving the quality of eye diagram and eliminating the crosstalk obviously.

Design and Simulation of Cmos Circuit Structure for CTL-CTM Crosstalk Cancellation Method in High-Speed Interconnects

“…The crosstalk cancellation method of CTL-CTM was proposed previously [5]. The fundamental is to describe the signal relationship between the ports of the transmission channel according to the transfer function of the channel model in Fig.…”

“…where H(ω) is the transfer function of microstrip lines, and C(ω) is the transfer function of the far-end crosstalk between microstrip lines. Since the transfer function has the same physical meaning as the S-parameter in the interconnect lines, under weak coupling, H(ω) and C(ω) are as shown in Equations (2) and (3) [5].…”

“…where Δβ = β e − β o ; β e and β o are respectively the even mode and odd mode propagation constants, and l is the coupled length. The transfer function in Equation ( 1) is converted into a diagonal matrix by the eigen value decomposition (EVD) of CTL-CTM matrix, as in Equations ( 4) and (5). Then, transmission line signals are linearly combined and transformed to form orthogonal mode.…”

“…The method of eliminating the crosstalk between microstrip lines based on coupled transmission line channel transmission matrix (CTL-CTM) in reference [5] is effective, but no specific circuit design and implementation is carried out. In this paper, a metal oxide semiconductor field effect transistor (MOSFET) is used to design the circuit for the proposed method.…”

Anti-Crosstalk Noise Performance Analysis of Multi-Symbol Transmission and Joint Crosstalk Reduction Method

“…Although this method can effectively restrain crosstalk, its application is hampered by drawbacks, such as cost, process, and implementation complexity. In [8] and [9], several methods based on copper interconnection, such as multilevel transmission and linear combination transformation, are proposed to reduce crosstalk. Given that weak coupling is the precondition to reduce crosstalk by signal linear combination transformation, the application can only be used under the 3W rule (3W rule: The distance from one center point to the other of the adjacent transmission lines is three times of the line width).…”