关键词: 微分电路, 串扰, 传输线, 印刷电路板

Abstract:

In order to reduce the crosstalk between the transmission lines of printed circuit boards ( PCB) ,a method using a RC derivative circuit is proposed based on the derivative-transmission characteristics of the crosstalk. In this method,first,by analyzing the crosstalk-cancellation principle,a RC derivative circuit at the end of the transmission line is employed to obtain the derivative of the signal received on the aggressor line,thus generating a derivative signal with approximate amplitude and opposite phase to the far-end crosstalk signal on the victim line. Then,the derivative signal is adopted to cancel the crosstalk signal,so that the crosstalk is reduced. Meanwhile, an approximate formula is presented for calculating the parameter value in this crosstalk-cancellation derivative circuit. Simulated and experimental results show that the proposed method can attenuate the crosstalk peak by more than 10 dB; and that,as compared with the traditional methods using physical structure to reduce crosstalk,the proposed method is of a greatly-improved cancellation effect and the corresponding circuit is easy to realize with a low cost.

Key words: derivative circuit, crosstalk, transmission line, printed circuit boards