A　0.6V　full　wave　rectifier　with　current　mode　nested　and　periodic　feedback　loops　is　presented,　for　the　improved　dynamic　range　with　the　low　supply　voltage.　Compared　with　the　conventional　rectifiers,　the　rectifier　with　the　loops　is　characterized　by　the　micro　feedback　loop　nested　in　the　periodic　macro　one,　so　as　to　enlarge　the　dynamic　range　of　the　current　mode　signal　with　the　ultra　power　supply　voltage.　With　the　technique,　the　dynamic　range　of　the　fully　rectified　signal　should　be　optimized.　Fabricated　with　a　0.18　mu　m　CMOS　process,　with　the　typical　0.6V　supply　voltage,　the　minimum　amplitude　of　the　fully　rectified　signal　reaches　10　nA　with　the　input　signal　bandwidth　of　10　kHz　and　the　power　dissipation　of　50nW.