Hybrid DC-offset reduction method and system for direct conversion receiver Grant US-7933361-B2 United States of America 26 Apr 2011
Tunable Sallen-Key filter stage and filter assembly Grant US-7212068-B2 United States of America 01 May 2007
Tunable sallen-key filter stage and filter assembly Application EP-1583234-A3 European Patent Office 04 Oct 2006