Echo cancellation circuit

Abstract

The invention relates to an echo cancellation circuit. The circuit comprises a differential signal transmitting module and a first resistor module, and the differential signal transmitting module is configured as follows: a first output end is used for outputting a first initial transmitting signal, and a second output end is used for outputting a second initial transmitting signal which is an echo signal mutually with the first initial transmitting signal; and the first resistor module is electrically connected with the first output end and the second output end, and is used for generating a first target signal after echo signal elimination according to the received first initial emission signal, the second initial emission signal and the first cable signal. According to the echo cancellation circuit, the differential signal transmitting module and the first resistor module are arranged to cooperate with each other, so that echo signals in the circuit can be effectively eliminated, and the power consumption of the circuit is reduced.

Description

technical field [0001] The present application relates to the technical field of Ethernet signal processing, in particular to an echo cancellation circuit. Background technique [0002] With the rapid development of data transmission technology, the application of long-distance data transmission technology is very extensive. Among them, Ethernet, as a common long-distance signal transmission method, is suitable for most terminals. In the standard 1000BASE-TX and 100 / 1000BASE-T1 protocols, in order to reduce the number of external cables, it is required to send and receive signals on the same pair of cables, so the cables will generate echo signals while transmitting target signals, which will affect the signal normal output. [0003] However, the traditional solution is to set up a dual digital-to-analog converter (Digital to Analog Converter, DAC) in the circuit, wherein, one DAC is used to provide the transmission of the target signal, and the other DAC is used to replica...

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Problems solved by technology

[0004] However, on the one hand, the use of a dual DAC structure will bring matching errors, which will cause large power consumption in the circuit and poor echo cancellation effect. On the other hand, since common mode inductors (Common mode Choke, CMC) are often used in data transmission Filter common-mode noise, and when high-frequency signals pass through CMC, phase changes will occur. At this time, traditional technical solutions cannot eliminate echo signals.

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