Title :
Method to convert analog filters to digital filters
Author :
Grama, Lacrimioara ; Lodin, Alexandru ; Rusu, Calin ; Takala, Jarmo
Author_Institution :
Signal Process. Group, Tech. Univ. of Cluj-Napoca, Cluj-Napoca, Romania
Abstract :
The analog filters are usually converted to IIR digital filters using appropriate transformation of system function from s-domain to z-domain. Recently another approach of converting an analog filter described by a diagram or a netlist to a digital filter has been proposed. Using this Analog Filter Netlist to Digital Filter Statements (AFN-DFS) approach, one can use a previous implementation in analog domain and a software code for the digital filter may be available rapidly. In this paper, we present a state-space (SS) based approach that provides an automatic procedure to convert an analog filter described by a diagram or a netlist to a digital filter described in system function form. The procedure consists of three main parts: first the state-space of the analog filter is computed based on diagram or netlist of the analog circuit, then a conversion from analog domain to digital domain is used. Finally the digital filter is delivered in system function form.
Keywords :
IIR filters; analogue-digital conversion; AFN-DFS approach; IIR digital filters; SS-based approach; analog circuit diagram; analog circuit netlist; analog domain; analog filter netlist-digital filter statement approach; analog filter-digital filter convertion; automatic procedure; s-domain; software code; state-space-based approach; system function form; system function transformation; z-domain; Analog circuits; Digital filters; Equations; Mathematical model; SPICE; Transfer functions;
Conference_Titel :
Image and Signal Processing and Analysis (ISPA), 2013 8th International Symposium on
Conference_Location :
Trieste
DOI :
10.1109/ISPA.2013.6703781