Project database

The page provides a list of national and international projects where FER participates or has participated as a project coordinator or partner.


Projects

   

Project

Acronym:
Integrated Actve Filter for ADSL 
Name:
Integrated Systems for Analog and Mixed Signal Processing - Active-RC Filter for ADSL Communication Systems 
Project status:
From: 2013-01-20 To: 2015-01-20 (Completed)
Type (Programme):
BILAT 
Project funding:
-

International partner

Organisation Name:
Faculty of Electrical Engineering-University of Montenegro 
Organisation adress:
George Washington bb, ME-81000 Podgorica 
Organisation country:
Montenegro 
Contact person name:
Budimir Lutovac 
Contact person email:
Email 

Croatian partner

Organisation name:
Fakultet elektrotehnike i računarstva 
Organisation address:
Unska 3, HR-10000 Zagerb 
Contact person name:
Dražen Jurišić
Contact person tel:
01 6129 949 
Contact person fax:
01 6129 652 
Contact person e-mail:
Email 

Short description of project

The new structure of the active-RC filter that is used to build ADSL splitter is proposed. The most part of the ADSL filter can be integrated. The basis of this structure is a feedback loop that includes a capacitor. Using Miller's effect, this circuit is equivalent frequency-dependent capacitor. In the initial phase, the project develops a new sophisticated method for the design of such a feedback loop, taking into account the surrounding circuitry, thus, gaining a simpler and better implementation of the current POTS filter realization. Thanks to a thorough analysis of the filter structures, we have so far gained more insight into the question of stability, which can be used to design a stable filter. Finally, expanding the structure of the filter with the "Super C" to "Super L" elements we expect stable filter that works in the case of complex termination. The method is formulated in a general form, allowing any termination of the filter, even the complex one. Although we cannot find any filter that could meet all the specifications in the case of complex termination, the new method is a useful tool when it comes to designing a filter for complex termination. Since each country has its own standards for telephone networks, POTS filter needs to adapt to them. The main difference is the termination of the impedance that is used for adjustment of telephone equipment line. In the beginning, in most cases it was real termination, however, some countries have begun to use the complex impedance for a more precise representation of the line. Termination using the complex impedance arose as a new problem that is not well covered in the literature so far. In the conventional filter theory termination is mainly based on the real impedance. In this project, we need to find a method to modify the given POTS filter for the complex terminating impedance. Since the method, not only the solution of the problem is of interest, optimization procedures are avoided as far as possible in favor of the analytical derivation. The entire filter has to be integrated in CMOS technology. After testing it is possible to propose a filter for industrial purposes, i.e. integrated circuit as the IP (intellectual property), and installed in commercial integrated circuits, that are built into the modems or phones on the market.  

Short description of the task performed by Croatian partner

In the initial phase, the project develops a new sophisticated method for the design of such a feedback loop, taking into account the surrounding circuitry, thus, gaining a simpler and better implementation of the current POTS filter realization. Thanks to a thorough analysis of the filter structures, we have so far gained more insight into the question of stability, which can be used to design a stable filter. Finally, expanding the structure of the filter with the "Super C" to "Super L" elements we expect stable filter that works in the case of complex termination. The method is formulated in a general form, allowing any termination of the filter, even the complex one. Although we cannot find any filter that could meet all the specifications in the case of complex termination, the new method is a useful tool when it comes to designing a filter for complex termination. Since each country has its own standards for telephone networks, POTS filter needs to adapt to them. The main difference is the termination of the impedance that is used for adjustment of telephone equipment line. In the beginning, in most cases it was real termination, however, some countries have begun to use the complex impedance for a more precise representation of the line. The entire filter has to be integrated in CMOS technology.