| http://www.w3.org/ns/prov#value | - ituteCommunication system with demodulation of two-level differential amplitude-shift-keying signalsUS7773688 *Dec 20, 2004Aug 10, 2010Parkervision, Inc.Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multiple transistorsUS8077797 *Jun 24, 2010Dec 13, 2011Parkervision, Inc.Method, system, and apparatus for balanced frequency
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