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  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E94-C   No.6   pp.992-998
Publication Date: 2011/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.992
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
capacitive coupling,  proximity communication,  wireless connectors,  

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Summary: 
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.