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Isolation interface with capacitive barrier and method for transmitting a signal by means of such isolation interface

  • US 6,819,169 B1
  • Filed: 07/25/2003
  • Issued: 11/16/2004
  • Est. Priority Date: 01/06/2003
  • Status: Expired due to Term
First Claim
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1. Isolation interface with a capacitive barrier, comprisingat the input end of the capacitive barrier an input circuit (A1) with differential outputs for a first and a second logical output signals U1o+ and U1o

  • , respectively, that are replicas of a transmitted input signal Ui and are complementary to one another, a first barrier capacitor (C+) and a second barrier capacitor (C−

    ) for the first and second logical signals U1o+ and U1o

    , respectively, at the output end of the capacitive barrier, an output circuit (A2) with inputs for a first logical input signal U2i+ and a second logical input signal U2i

    , respectively, that are complementary to one another, and the output circuit (A2) comprises a first voltage comparator (Co+) and a second voltage comparator (Co−

    ), and characterized in that in the input circuit (A1) a first integrating unit (R1, C1)+ and a second integrating unit (R1, C1)−

    are provided, across which the first logical output signal U1o+ and the second logical output signal U1o

    , respectively, passed and by means of whose time constants the slope rates of the edges of the signals U1o±

    or the rising and falling-off times of the signals U1o±

    were adjusted, and that to an output terminal of the first barrier capacitor (C+) and of the second barrier capacitor (C−

    ) on the one hand and to a common potential terminal of the output circuit (A2) on the other hand, such a first resistor (R+) and a second resistor (R−

    ) are connected that the time constant of a first differentiating unit (C+, R+) made of the first barrier capacitor (C+) and of the first resistor (R+) and the time constant of the second differentiating unit (C−

    , R−

    ) made of the second barrier capacitor (C−

    ) and of the second resistor (R−

    ) are shorter than the rising and falling-off times of the logical output signals U1o+ and U1o

    being the replicas of the transmitted input signal Ui.

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