Ring Oscillator Based Delta-Sigma ADCs

In this work, we will review recent advances in VCO based low power ADCs as well as present a summary of our recent and on-going works. We will present a 18.5fJ/step discrete-time VCO-based 0–1 MASH ADC as well as a continuous-time, third-order purely VCO-based ADC architecture. We will also present applications of our ADCs for sensing, such as capacitance-to-digital conversion and current-to-digital conversion.

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[2]  Kyoungtae Lee,et al.  A Scaling-Friendly Low-Power Small-Area $\Delta\Sigma$ ADC With VCO-Based Integrator and Intrinsic Mismatch Shaping Capability , 2015, IEEE Journal on Emerging and Selected Topics in Circuits and Systems.

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[10]  Nan Sun,et al.  A 174.3-dB FoM VCO-Based CT $\Delta \Sigma $ Modulator With a Fully-Digital Phase Extended Quantizer and Tri-Level Resistor DAC in 130-nm CMOS , 2017, IEEE Journal of Solid-State Circuits.

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[17]  Nan Sun,et al.  An Energy-Efficient Hybrid SAR-VCO $\Delta \Sigma $ Capacitance-to-Digital Converter in 40-nm CMOS , 2017, IEEE Journal of Solid-State Circuits.