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  • hod thereofUS7773688 *Dec 20, 2004Aug 10, 2010Parkervision, Inc.Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multiple transistorsUS8571135 *Dec 12, 2011Oct 29, 2013Parkervision, Inc.Method, system and apparatus for balanced frequency up-conversion of a baseband signalUS20120114078 *Dec 12, 2011May 10, 2012Parkervision, In
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