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Interface circuit of differential signaling system

  • US 20030081663A1
  • Filed: 06/04/2002
  • Published: 05/01/2003
  • Est. Priority Date: 11/01/2001
  • Status: Abandoned Application
First Claim
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1. An interface circuit, which is connected to a data transmission line through a termination resistor at both a first signal input terminal and a second signal input terminal and receives a pair of differential signals transmitted through the data transmission line as reception data, comprising:

  • a receiving end operational amplifier, having a non-inversion input terminal, an inversion input terminal and an output terminal, for receiving one differential signal at the non-inversion input terminal through the first signal input terminal as a first signal, receiving the other differential signal at the inversion input terminal through the second signal input terminal as a second signal, and sending out an output signal from the output terminal; and

    impedance control means for setting the receiving end operational amplifier to a high impedance state in a case where the first signal input terminal or the second signal input terminal is set to an open-circuiting state or a short-circuiting state.

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