contactless coupling between a host unit and a smart card
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United States of America Patent
Stats
-
Mar 20, 2001
Grant Date -
N/A
app pub date -
Oct 1, 1999
filing date -
Apr 2, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and module for transferring energy, clock frequency and data information without using an electrically conducting connection between a portable module and host equipment. Energy is transferred as optical radiation from at least two distinct light sources with intensities alternating between the minimum and maximum values in such a way that when one intensity goes from minimum to maximum the other goes from maximum to minimum wherein total intensity of optical radiation received by the module and supply voltage formed therefrom is nearly constant. The clock frequency is formed by and detected as the cyclical alteration of light intensities. Data is transferred as a modulation of the clock frequency.
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