IEEE Transactions on Circuits & Systems II Express Briefs · 2018 · 56 citations · 8 references
EngineeringComputer EngineeringElectrical EngineeringAnalog ElectronicsBiomedical Signal ProcessingLow-power DesignAnalog Integrated CircuitsCmos Circuit DesignDigital Integrated CircuitsLow-noise Circuit DesignLow-power Digital Circuit DesignMixed-signal Integrated Circuit DesignAnalog-digital ConversionAnalog-to-digital ConversionAnalog-to-digital ConvertersBiomedical ApplicationsCmos Analog Circuit DesignCmos Analog Integrated CircuitsComparator DesignComparators
This brief presents the design of an ultra-low power level-crossing analog-to-digital converter (LC-ADC) for IoT and biomedical applications. The proposed LC-ADC utilizes only one multi-level comparator instead of multiple comparators as in conventional LC-ADC, leading to simplified implementation and significant reduction in power. Implemented in 0.18- ${\mu}\text{m}$ CMOS process, the LC-ADC achieves 7.9 equivalent number of bits with a 49 dB signal-to-noise and distortion ratio at the input frequency up to 1 kHz. The measured minimum power is only 4.2 nW at the supply voltage of 0.55 V.
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