关键词: 电感耦合连接器, 反相不归零码, 均衡, 符号间干扰

Abstract:

The inductively coupled connector can be used for high-speed digital signal transmission of board-level interconnect. With the increasing signal transmission rate or transformer inductance, the receiver-side of the inductively coupled connector will suffer excessive inter-symbol interference, and can not effectively recover the signal. To solve this problem, the ALTERA driver-side equalization scheme is proposed by analysing the reasons of inter-symbol interference and the equalization ratio calculation method of this scheme is also given. The equalization scheme is implemented through selection of an appropriate equalization ratio to increase high frequency components of the signal and reduce the low frequency components of the signal at the driver-side to reduce the inter-symbol interference and improve pulse magnitude, and the signal can be recovered with a simple low power trigger circuit. Simulation results show that using the driver-side equalization scheme can effectively eliminate inter-symbol interference, and that the choice of inductance and the signal transmission data rate are independent of each other, so the larger inductance of transformer can transmit high-speed digital signals.

Key words: inductively coupled connector, non-return to zero, equalization, inter-symbol interference