This　paper　presents　a　low　power,　energy-efficient　precision　CMOS　temperature　sensor.　The　front-end　circuit　is　based　on　bipolar　junction　transistors,　and　employs　a　pre-bias　circuit　and　bipolar　core.　To　reduce　measurement　errors　arising　from　current　ratio　mismatch,　a　new　dynamic　element-matching　mode　is　proposed,　which　dynamically　matches　all　current　sources　in　the　front-end　circuit.　The　first-order　fitting　and　third-order　fitting　are　used　to　calibrate　the　output　results.　On　the　basis　of　simulation　results,　the　sensor　achieves　3　sigma-inaccuracies　of　+0.18/-0.13　degrees　C　from　-55　degrees　C　to　+125　degrees　C.　Measurement　results　demonstrate　sensor　3　sigma-inaccuracies　of　+/-　0.2　degrees　C　from　0　degrees　C　to　+100　degrees　C.　The　circuit　is　implemented　in　0.18　m　CMOS,　and　consumes　6.1　A　with　a　1.8　V　supply　voltage.