A hybrid SAR-VCO ΔΣ ADC with first-order noise shaping

  title={A hybrid SAR-VCO ΔΣ ADC with first-order noise shaping},
  author={Arindam Sanyal and Kareem Ragab and Long Chen and T. R. Viswanathan and Shouli Yan and Nan Sun},
  journal={Proceedings of the IEEE 2014 Custom Integrated Circuits Conference},
A scaling-friendly, hybrid, two-stage ΔΣ ADC with a 5-bit SAR as first stage and a VCO as second stage is presented in this work. Since the VCO can provide fine quantization for small signals in the time-domain, it is used to directly quantize the SAR residue without OTA-based residue amplification. Also, having a small input swing obviates the need for VCO non-linearity calibration. The VCO phase overflow problem is solved by using a counter to record the number of overflows, thus allowing a… CONTINUE READING
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