IEIE Transactions on Smart Processing and Computing

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Multi-bit VCO-based Linear Quantizer with Frequency-to-current Feedback using a Switched-capacitor Structure

  • Park, Sangyong (School of Electrical Engineering, Chung-Ang University) ;
  • Ryu, Hyuk (School of Electrical Engineering, Chung-Ang University) ;
  • Sung, Eun-Taek (School of Electrical Engineering, Chung-Ang University) ;
  • Baek, Donghyun (School of Electrical Engineering, Chung-Ang University)
  • Received : 2015.05.28
  • Accepted : 2015.06.10
  • Published : 2015.06.30
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Abstract

In this letter, we present a new linearization method for a voltage controlled oscillator (VCO)-based quantizer in an analog-to-digital converter (ADC). The nonlinearity of the VCO generates unwanted harmonic spurs and reduces the signal-to-noise and distortion ratio (SNDR) of the VCO-based quantizer. This letter suggests a frequency-to-current feedback method to effectively suppress harmonic distortion. The proposed method decreases the harmonic spurs by more than 53 dB. And a VCO-based quantizer employing the proposed linearization method achieves a high SNDR of 74.1 dB.

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References

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Cited by

  1. Preweighted Linearized VCO Analog-to-Digital Converter vol.25, pp.6, 2017, https://doi.org/10.1109/TVLSI.2017.2661754