The　study　proposed　a　switched-capacitor　delta-sigma　modulator　with　single-loop　and　third-order　structures　for　wearable　electrocardiogram　acquisition　device　for　low-power　and　high-precision　applications.　Several　techniques,　including　chain　of　integrators　with　weighted　feedforward　structure,　gain-enhanced　current-mirror　push-pull　operational　transconductance　amplifier,　and　dynamic　comparator　with　a　set-reset　latch　are　adopted　to　improve　the　signal-to-noise　ratio　(SNR)　and　reduce　the　power　consumption.　Simulation　results　shows　that　the　SNR　and　the　corresponding　effective　number　of　bits　are　104.2　dB　and　17.02　bits,　respectively,　which　fulfill　the　requirements　of　an　presented　system.　The　circuit　will　be　fabricated　by　the　SMIC　using　a　0.18　μm　general　purpose　process　in　the　near　future.　©　2019　IEEE.