A purely-VCO-based single-loop high-order continuous-time ΣΔ ADC

@article{Yoon2014APS,
  title={A purely-VCO-based single-loop high-order continuous-time ΣΔ ADC},
  author={Yeonam Yoon and Kyoungtae Lee and Peijun Wang and Nan Sun},
  journal={2014 IEEE International Symposium on Circuits and Systems (ISCAS)},
  year={2014},
  pages={926-929}
}
This paper reports a voltage-controlled oscillator (VCO)-based single-loop continuous-time (CT) ΣΔ analog-to-digital converter (ADC) that does not need any OTA-based analog integrator. It achieves the second-order noise shaping by cascading two VCO-based integrators and removing the sampling operation in the first VCO-based integrator. Behavioral simulations confirm the validity of the proposed ADC architecture. 

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