Zigzag-Shaped Coil Array Structure for Wireless Chip-to-Chip Communication Applications

In this paper, we propose a zigzag-shaped coil array structure for wireless chip-to-chip communication. The proposed structure is designed for high-speed memory, which requires a pad number on the order of tens. First, a general coil array is investigated with respect to undesired coupling between adjacent coils. We also investigated a coil array for which shielding patterns are inserted between adjacent coils to reduce cross-talk problems. To solve the cross-talk and chip area problems associated with coil arrays, a zigzag pattern is proposed. Additionally, a layout technique for the circuit block of the memory transceiver that is connected to the coil array is proposed to minimize the total chip size. With the experimental results, the feasibility of the proposed zigzag-shaped coil array is successfully demonstrated.