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This work presents a 9.2 μA fully-passive sensor tag in 0.13 μm CMOS for biomedical research and human health monitoring. The sensor tag includes a 260 nA temperature-compensated 3 MHz reference oscillator. Subthreshold tag logic consumes 6μA from the 0.7 V supply. A 1.2 μA fully-differential chopper-stabilized amplifier with 1.25 μVrms input-referred noise is integrated for sensor interfacing. The system exhibits a range of 3 m and was deployed to perform wireless in-flight recording on a moth.