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A VCO-based delta-sigma modulator (ΔΣM) is proposed for bio-potential signal acquisition. The VCO quantizer is placed in a loop with 1-bit feedback to improve modulator linearity. Furthermore, frequency calibration employing gated VCO technique is proposed to improve the operation range. Fabricated in a 0.18µm CMOS, this chip consumes 379nW and occupies an active area of 0.06mm2. Over a 2kHz signal...
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