Patent ID: 6181167
Filing Date: 2001-01-30
Classification: H03K,H04L

Abstract:
A device for the simultaneous transmission of a first data signal and a second data signal over a single communication line in opposite directions, wherein the data signals are represented by a voltage and a current, respectively, present on said line, said device having a positive supply voltage and a circuit ground, said device comprising:a first transceiver comprising:a first input/output terminal;a resistive load having first and second ends, said second end of said resistive load connected to said first input/output terminal;a voltage driver having an input connected to a first transmission signal, and having an output connected to said first end of said resistive load;a current sensing circuit having a first input, a second input and an output, said first input connected to said first input/output terminal, said second input connected to said first end of the resistive load, said output providing a first received signal;a second transceiver comprising:a second input/output terminal;a voltage receiver having a single input connected to said second input/output terminal, and having an output providing a second received signal;a send logic high circuit connected between said positive supply voltage and said second input/output terminal, and having an input connected to a second transmission signal;a send logic low circuit connected between said circuit ground and said second input/output terminal, and having an input connected to said second transmission signal; andsaid communication line connecting said first input/output terminal of said first transceiver to said second input/output terminal of said second transceiver.