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Switched-R tuning technique for Gm-C filters

TitleSwitched-R tuning technique for Gm-C filters
Publication TypeJournal Article
Year of Publication2010
AuthorsWang, T., and G. C. Temes
JournalElectronics Letters
Volume46
Issue4
Pagination275 - 276
Date Published02/2010
ISSN00135194
Abstract

A new tuning technique is proposed for Gm-C filters. The transconductance cells are tuned using switched resistors (SRs), which change the equivalent reference resistance of each cell. In the tuning circuit, the equivalent resistance of an SR branch is forced to equal that of a switched-capacitor (SC) branch by a feedback loop containing a continuous-time comparator. Thus, using the output of the loop all time constants of the Gm-C filter can be tuned simultaneously. The simulation of a second-order Butterworth filter is described to verify the effectiveness and excellent linearity of the proposed tuning method.

DOI10.1049/el.2010.2446
Short TitleElectron. Lett.