Bidirectional low-pass filter suitable for communication network

Abstract

This invention provides a two-way low pass filtering containing a first a second end, a third and a fourth input / output ends, a first a second, a third and a fourth inductors, a first capacitor with first, second ends, a fifth, a sixth, a seventh and a eighth inductors, a first, seccond, third and fourth compensation circuits, and a first, second, third and fourth high frequency attenuation strengthen circuits which designs four compensation circuits and four high frequency attenuation strengten circuits for increasing its high frequency attenuation performance under the circumstances of not influencing its low frequency attenuation value.

Description

technical field [0001] The invention relates to a bidirectional low-pass filter, especially a bidirectional low-pass filter suitable for a user end or a central office end of a communication network. Background technique [0002] In order to achieve faster data transmission on the Internet, various broadband Internet access technologies have emerged as the times require. Among them, Digital Subscriber Line (DSL) is a high-speed transmission through the copper telephone lines that ordinary users already have. Since this technology can derive many different versions of technology, it is mostly called xDSL, and the most common technology at present is Asymmetric Digital Subscriber Line (ADSL for short). [0003] See figure 1 , which is a schematic diagram of the application architecture of an asymmetric digital subscriber line (ADSL). It can be clearly seen from the figure that the voice grade terminal 11 (Voice Grade Terminal, such as a telephone set, facsimile machine) and t...

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Problems solved by technology

[0006] The main purpose of the present invention is to solve the defect that the existing low-pass filter cannot provide bidirectional work function, and then provide a bidirectional low-pass filter

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