The invention relates to an integrated circuit arrangement with an active filter comprising transconductance stages, each being adjustable by means of a bias current to be supplied, and comprising a tuning device for tuning the filter, which tuning device adjusts the bias currents of the transconductance...http://www.google.de/patents/US6838929?utm_source=gb-gplus-sharePatent US6838929 - Integrated circuit arrangement comprising an active filter and a method for tuning an active filter
