INTERFACE DIGITAL COMMUNICATION CIRCUIT FOR WIRED PAIR WITH INDIVIDUALLY ADJUSTABLE TRANSITION BORDERS Russian patent published in 2017 - IPC H03K17/00 

FIELD: radio engineering, communication.

SUBSTANCE: interface circuit allows the device to communicate with the wired pair. The interface circuit includes: a diode bridge having polar-independent input terminals connected to the wired pair and the first and the second output terminals having positive polarity and negative polarity, respectively; the first galvanic isolation device for outputting the received signal received over the wired pair through the diode bridge; the second galvanic isolation device receiving the transmitted signal; a voltage-controlled variable resistive element connected to the positive and negative output terminals of the diode bridge; and the first and the second filters connected by a cascade between the second galvanic isolation device and the voltage-controlled variable resistive element. The first filter has decoupled charging and discharging paths in such a way as to decouple the rise time of the transmitted signal from the time of falling of the transmitted signal. The second filter has a frequency response dependent on the voltage.

EFFECT: voltage-controlled variable resistive element provides the transmitted signal to the wired pair through the diode bridge.

20 cl, 4 dwg