A capacitive coupling wireless connector circuit is implemented with 50µm × 50µm 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_DD or V_SS, instead of 1/2V_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, 2⁷-1PRBS signal at 1mW while increasing design freedom of the wireless connectors.