Advanced ADSL splitter
View Patent ↗A telecommunication filter arrangement comprising two similar filter cells (T 1 , S 1 a , S 1 b , R 1 a , R 1 b ; T 2 , S 2 a , S 2 b , R 2 a , R 2 b ) coupled in cascade to provide a POTS/ADSL splitter. The filter arrangement further comprises at third filter cell (C 3 , R 3 , S 3 ) coupled in-between the two other filter cells and comprising a cell capacitor (C 3 ) series coupled with the parallel connection of a cell coil (S 3 ) and a cell resistor (R 3 ). A 3 rd order filter is so provided and the filter arrangement behaves as known 5th order filter but with a fixed “switchable insertion loss circuit”. This filter arrangement is thereby cheap, simple and has a small size with respect to the known filter arrangements, while providing good performances.
1. A telecommunication filter arrangement comprising: at least a first filter cell and a second filter cell coupled in cascade between a first filter arrangement port and a second filter arrangement port,
each filter cell comprising a transformer of which each winding is coupled in parallel with a resistor,
the transformer of each of said first and second filter cell comprises a first winding coupled in parallel with a first resistor and a second winding coupled in parallel with a second resistor,
said first filter arrangement port includes a first filter arrangement terminal and a second filter arrangement terminal,
said second filter arrangement port includes a third filter arrangement terminal and a fourth filter arrangement terminal,
said first filter arrangement terminal is coupled to said third filter arrangement terminal via the series coupling of the first windings of the transformers of said first and second filter cells, and
said second filter arrangement terminal is coupled to said fourth filter arrangement terminal via the series coupling of the second windings of the transformers of said first and second filter cells, and wherein
said telecommunication filter arrangement further includes a third filter cell coupled between said first and said second filter cell,
said third filter cell is coupled between the first windings of the transformers of said first and second filter cells, and the second windings of the transformers of said first and second filter cells, and
said third filter cell includes a cell capacitor series coupled with the parallel connection of a cell winding and a cell resistor.
2. The telecommunication filter arrangement according to claim 1 , wherein a second capacitor is coupled between said first and said second filter arrangement terminal.
3. The telecommunication filter arrangement according to claim 1 ,
wherein said first filter arrangement port is coupled to a Plain Old Telephone Service subscriber set,
and wherein said second filter arrangement port is coupled to a telecommunication line of an Asymmetric Digital Subscriber Line telecommunication system.
4. The telecommunication filter arrangement according to claim 1 ,
wherein the filter arrangement is a third-order filter.
5. The telecommunication filter arrangement according to claim 1 ,
wherein the filter arrangement exhibits fifth-order frequency response.