1 Gb/s, 50 [mu]m x 50 [mu]m Pads on Board Wireless Connector Based on Track-and-Charge Scheme Allowing Contacted Signaling

A capacitive coupling wireless connector circuit is implemented with 50[mu]m x 50[mu]m pads, which is a 25X reduction of pad size compared with previous wireless connectors by allowing contacting and non-contacting modes. The proposed track and charge scheme allows both contacting and non-contacting communication through PCB capacitive pads. By making the precharge level of the input V sub(DD) or V sub(SS), instead of 1/2V sub(DD), the time necessary to precharge is reduced. The proposed digitally tunable comparator does not require analog voltages, reduces the power to less than 1/20 at lower frequencies compared to previous capacitive coupling receivers. A test chip successfully transmitted and received 1Gb/s, 2 super(7)-1PRBS signal at 1mW while increasing design freedom of the wireless connectors.