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This paper demonstrates a 0.8-V rail-to-rail operational amplifier (op-amp) for ultra-low-power Internet-of-Things (IoT) sensor nodes. To suppress the leakage current in the logic part, a FinFET technology with 0.4-V threshold voltage (Vt), is chosen. To realize the rail-to-rail operation in the small common-mode (CM) voltage headroom, VDD–Vt, a 4-stage chopper-stabilized topology with high-pass filters,...
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