Full duplex communication circuit and method therefor

Abstract

Duplex communications are facilitated. In connection with various example embodiments, current sources are used to drive transistor-based circuits coupled across a first resistive circuit, to send signals on a communications medium. While driving the transistor-based circuits, the current sources are used to drive reference transistor-based circuits coupled across a second resistive circuit. A differential output signal based upon a power-related value across the first resistive circuit, less a power-related value across the second resistive circuit. This differential output signal characterizes a power-related value corresponding to a received signal on the communications medium, as gleaned from a total signal corresponding to both transmitted and received signals, less a signal corresponding to the transmitted signal.

Description

technical field [0001] The present invention relates generally to communications, and more particularly to a full-duplex communications circuit and method. Background technique [0002] Communication buses use a variety of communication methods to suit the specific application and available communication circuitry. Many communication methods involve transceivers that simultaneously transmit and receive signals on separate twisted-pair cable pairs. Therefore, the signal on the corresponding bus is the sum of the two transmitted signals. [0003] In order to receive the correct transmitted signal, the receiver subtracts its own transmitted signal from the signal it has received from the bus. This subtraction unit is often referred to as a hybrid circuit and can be used for full-duplex serial communication over separate cable pairs. [0004] Although useful in a variety of applications, this method of signal subtraction can be susceptible to error and / or challenging to imple...

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Problems solved by technology

[0004] Although useful in a variety of applications, this method of signal subtraction can be susceptible to error and / or challenging to implement

For example, driving a bus with such a signal may require synchronization for noise reduction, which may be difficult to achieve

Also, many approaches use multiple current sources and / or other circuit components, which can add complexity and cost

[0005] The above issues have been raised and will continue to pose challenges for bus communication, especially for achieving full-duplex communication

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