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1 Gb/s, 50 µm 50 µm Pads on Board Wireless Connector Based on Track-and-Charge Scheme Allowing Contacted Signaling
Katsuyuki IKEUCHI Hideki KUSAMITSU Mutsuo DAITO Gil-Su KIM Makoto TAKAMIYA Takayasu SAKURAI
IEICE TRANSACTIONS on Electronics
Publication Date: 2011/06/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
capacitive coupling, proximity communication, wireless connectors,
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A capacitive coupling wireless connector circuit is implemented with 50 µm 50 µm 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 VDD or VSS, instead of 1/2 VDD, 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 1 Gb/s, 27-1PRBS signal at 1 mW while increasing design freedom of the wireless connectors.