Title :
Shadow filters for orthogonal modification of characteristic frequency and bandwidth
Author :
Biolkova, Viera ; Biolek, Dalibor
Author_Institution :
Dept. of Radio Electron., Brno Univ. of Technol., Brno, Czech Republic
Abstract :
The idea of shadow filters for modifying the characteristic frequency f0 of second-order filter cells via an external amplifier is generalised to the case of independent control of f0 and bandwidth. This theory is confirmed experimentally on a current-mode biquad.
Keywords :
amplifiers; biquadratic filters; current-mode circuits; bandwidth; characteristic frequency; current-mode biquad; external amplifier; orthogonal modification; second-order filter cells; shadow filter;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.0717
