Title :
A 379nW 58.5dB SNDR VCO-based ΔΣ modulator for bio-potential monitoring
Author :
Ying-Da Chang ; Chan-Hsiang Weng ; Tsung-Hsien Lin ; Chorng-Kuang Wang
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
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 bandwidth, the proposed ΔΣM achieves a peak SNDR of 58.5dB, which results in an FoM of 137fJ/conv.-step.
Keywords :
CMOS integrated circuits; delta-sigma modulation; medical signal processing; voltage-controlled oscillators; ΔΣ modulator; CMOS; SNDR VCO; VCO quantizer; bio-potential monitoring; bio-potential signal acquisition; delta-sigma modulator; frequency 2 kHz; frequency calibration; power 379 nW; size 0.18 mum; voltage-controlled oscillators; word length 1 bit; CMOS integrated circuits; Calibration; FCC; Logic gates; Modulation; Radiation detectors; Voltage-controlled oscillators;
Conference_Titel :
VLSI Circuits (VLSIC), 2013 Symposium on
Conference_Location :
Kyoto
Print_ISBN :
978-1-4673-5531-5
