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Multiple order low pass filter for an xDSL splitter in a telecommunication system

A technology of low-pass filter and telecommunication system, which is applied in the direction of transmission system, wired transmission system, coupling substation interface circuit, etc., and can solve the problems that cannot be further deployed in volume

Inactive Publication Date: 2010-04-21
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Further, this active solution cannot further be used for volumetric deployment due to the aforementioned drawbacks

Method used

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  • Multiple order low pass filter for an xDSL splitter in a telecommunication system
  • Multiple order low pass filter for an xDSL splitter in a telecommunication system
  • Multiple order low pass filter for an xDSL splitter in a telecommunication system

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Embodiment Construction

[0036] figure 1 The low-pass filter shown in is a single-ended version of a filter such as may be used in xDSL telecommunication systems. The low-pass filter has an input terminal Vin and an output terminal Vout relative to the ground terminal Vgrd. The coil Lp has a first node 1 connected to the input Vin via an impedance, preferably consisting of a sense resistor Rsense, and a second node 2 connected to the output Vout. The filter further comprises a capacitor C connected between the output terminal Vout and the ground terminal Vgrd. The low-pass filter also includes a filter enhancement circuit FEM1 composed of an impedance Rsense, an amplifier A and a second coil Ls. The input of the amplifier A is connected across the impedance Rsense, and its output is connected to the ground terminal Vgrd via the second coil Ls. The first coil Lp and the second coil Ls constitute the primary and secondary windings of the transformer T, respectively.

[0037] The basic idea of ​​the ...

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Abstract

A low pass filter comprising a first coil (Lp1) coupled between a first input (Vinl) and a first output (Voutl) terminal of the filter, a second coil (Lp2) coupled between a second input (Vin2) and asecond output (Vout2) terminal of this filter, and a capacitor (C) coupled between the first and second output terminals. filter further includes filter enhancement means (FEM) comprising a current sense circuit (CS) having first inputs coupled across a first impedance (Rsensel) coupled between the first input terminal and the first coil, second inputs coupled across a second impedance (Rsense2) coupled between the second input terminal and the second coil, and an amplifier (A) having an input coupled to an output of the current sense circuit (C3)and having an output connected to a ground terminal (Vgrd) via a third (Ls1) and a fourth (Ls2) coils, mounted in parallel. The coils are magnetically coupled by pairs and are located on a same core.

Description

technical field [0001] The invention relates to a single-ended low-pass filter comprising a coil connected between an input and an output, and a capacitor connected between said output and ground. Background technique [0002] Such basic single-ended low-pass filters are generally known and used in the art. [0003] This same concept is used eg as a low pass filter in a splitter of an xDSL telecommunication system. In such applications, however, a balanced or differential low-pass filter is preferred. [0004] Therefore, although the aforementioned single-ended low-pass filter is not excluded as an object of the present invention, the latter invention further relates to a balanced low-pass filter comprising a A first coil, a second coil connected between a second input and a second output of the filter, and a capacitor connected between the first and second output. Typically, the first and second coils have a common magnetic core. [0005] It should be noted that the bal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H11/04H04B3/21H04M1/74
CPCH03H7/09H03H1/0007H04Q1/20H03H1/00
Inventor E·欧普德贝克
Owner ALCATEL LUCENT SAS