Design of self-biased fully differential receiver and crosstalk cancellation for capacitive coupled vertical interconnects in 3DICs

Interconnect density in traditional capacitive coupling electrodes array is limited by capacitive crosstalk between electrodes. In this work, we propose an array structure where single-ended and differential pair electrodes (designed in the common-centroid structure) are alternatively placed horizontally and vertically. The proposed structure not only cancels out the crosstalk noise but also reduces the spacing requirement between electrodes. A novel self-biased fully differential receiver suppresses the common-mode coupled crosstalk in the differential electrodes. The receiver provides CMRR of 25dB and can recover wide band (10 kHz ~ 1 GHz) signals with 32dB gain. It consumes 25 μW at 1 GHz. It is designed and simulated in a 1.5V 0.13μm CMOS technology.