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A 174.7-dB FoM, 2
- Source :
- IEEE transactions on biomedical circuits and systems. 15(6)
- Publication Year :
- 2021
-
Abstract
- This paper presents a second-order voltage-controlled oscillator (VCO)-based front-end for the direct digitization of biopotential signals. This work addresses the non-linearity of VCO-based ADC architectures with a mismatch resilient, multi-phase quantizer, a gated-inverted-ring oscillator (GIRO), achieving110-dB SFDR. Leveraging the time-domain encoding of the first integrator, the ADC's power is dynamically scaled with the input amplitude enabling up to 35% power savings in the absence of motion artifacts or interference. An auxiliary input-impedance booster increases the ADC's input impedance to 50 MΩ across the entire bandwidth. Fabricated in a 65-nm CMOS process, this ADC achieves 92.3-dB SNDR in a 1 kHz BW while consuming 5.8 µW for a 174.7 dB Schreier FoM.
- Subjects :
- Amplifiers, Electronic
Equipment Design
Subjects
Details
- ISSN :
- 19409990
- Volume :
- 15
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- IEEE transactions on biomedical circuits and systems
- Accession number :
- edsair.pmid..........463263701f7359e91d87bc926fc88a39