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  • 2000Feb 8, 2005Parkervision, Inc.Method, system and apparatus for balanced frequency up-conversion of a baseband signal and 4-phase receiver and transceiver embodimentsUS7773688 *Dec 20, 2004Aug 10, 2010Parkervision, Inc.Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multiple transistors* Cited by examinerNon-Patent Citatio
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