Echo Cancellation Circuit

Abstract

The present application relates to an echo cancellation circuit. The circuit includes a differential signal transmitting module and a first resistance module, and the differential signal transmitting module is configured as follows: the first output terminal is used to output a first initial transmission signal, and the second output terminal is used to output the first initial transmission signal. The transmission signals are the second initial transmission signals of the echo signals; the first resistance module is electrically connected to the first output terminal and the second output terminal, and is used for receiving the first initial transmission signal , the second initial transmission signal and the first cable signal generate a first target signal after canceling echo signals. The echo canceling circuit of the present application can effectively cancel the echo signal in the circuit and reduce the power consumption of the circuit by setting the differential signal transmitting module and the first resistor module to cooperate with each other.

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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