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Origin of frequency-dependent distortion and calibration for ring oscillator VCO ADCs

Brendan Saux (UGent) , Jonas Borgmans, Johan Raman (UGent) and Pieter Rombouts (UGent)
(2024) IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS. 71(8). p.3670-3674
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Abstract
This brief identifies the cause of frequency-dependent distortion in ring oscillator voltage-controlled oscillator (VCO) analog-to-digital converters (ADCs). First, a VCO model is presented which takes into account the capacitance at the VCO terminals. This allows the most common drive configurations to be analyzed to determine the origin of the frequency-dependent distortion and the vulnerability of the different drive configurations. A conclusion is that voltage control is relatively robust against this effect. Based on the preceding analysis, a novel foreground calibration procedure is developed. The effectiveness of the proposed calibration method is demonstrated for a manufactured open-loop VCO ADC in 28nm CMOS and compared to results obtained using a prior art calibration method and results without calibration. For a 750 mV(pp) 26.5 MHz signal, the proposed calibration procedure leads to an improvement in THD of 20 dB and 47 dB compared to results using prior art calibration and no calibration respectively.
Keywords
Electrical and Electronic Engineering, analog-to-digital conversion, voltage-controlled oscillator, VCO ADC, calibration, Voltage-controlled oscillators, Calibration, Distortion, Delays, Capacitance, Voltage control, Art, ADC, VCO, distortion, dynamic, DELTA-SIGMA ADC, FOM

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MLA
Saux, Brendan, et al. “Origin of Frequency-Dependent Distortion and Calibration for Ring Oscillator VCO ADCs.” IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, vol. 71, no. 8, 2024, pp. 3670–74, doi:10.1109/tcsii.2024.3370121.
APA
Saux, B., Borgmans, J., Raman, J., & Rombouts, P. (2024). Origin of frequency-dependent distortion and calibration for ring oscillator VCO ADCs. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 71(8), 3670–3674. https://doi.org/10.1109/tcsii.2024.3370121
Chicago author-date
Saux, Brendan, Jonas Borgmans, Johan Raman, and Pieter Rombouts. 2024. “Origin of Frequency-Dependent Distortion and Calibration for Ring Oscillator VCO ADCs.” IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 71 (8): 3670–74. https://doi.org/10.1109/tcsii.2024.3370121.
Chicago author-date (all authors)
Saux, Brendan, Jonas Borgmans, Johan Raman, and Pieter Rombouts. 2024. “Origin of Frequency-Dependent Distortion and Calibration for Ring Oscillator VCO ADCs.” IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 71 (8): 3670–3674. doi:10.1109/tcsii.2024.3370121.
Vancouver
1.
Saux B, Borgmans J, Raman J, Rombouts P. Origin of frequency-dependent distortion and calibration for ring oscillator VCO ADCs. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS. 2024;71(8):3670–4.
IEEE
[1]
B. Saux, J. Borgmans, J. Raman, and P. Rombouts, “Origin of frequency-dependent distortion and calibration for ring oscillator VCO ADCs,” IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, vol. 71, no. 8, pp. 3670–3674, 2024.
@article{01HQR79VS6NY2PF3XDHD544D6M,
  abstract     = {{This brief identifies the cause of frequency-dependent distortion in ring oscillator voltage-controlled oscillator (VCO) analog-to-digital converters (ADCs). First, a VCO model is presented which takes into account the capacitance at the VCO terminals. This allows the most common drive configurations to be analyzed to determine the origin of the frequency-dependent distortion and the vulnerability of the different drive configurations. A conclusion is that voltage control is relatively robust against this effect. Based on the preceding analysis, a novel foreground calibration procedure is developed. The effectiveness of the proposed calibration method is demonstrated for a manufactured open-loop VCO ADC in 28nm CMOS and compared to results obtained using a prior art calibration method and results without calibration. For a 750 mV(pp) 26.5 MHz signal, the proposed calibration procedure leads to an improvement in THD of 20 dB and 47 dB compared to results using prior art calibration and no calibration respectively.}},
  author       = {{Saux, Brendan and Borgmans, Jonas and Raman, Johan and Rombouts, Pieter}},
  issn         = {{1549-7747}},
  journal      = {{IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS}},
  keywords     = {{Electrical and Electronic Engineering,analog-to-digital conversion,voltage-controlled oscillator,VCO ADC,calibration,Voltage-controlled oscillators,Calibration,Distortion,Delays,Capacitance,Voltage control,Art,ADC,VCO,distortion,dynamic,DELTA-SIGMA ADC,FOM}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{3670--3674}},
  title        = {{Origin of frequency-dependent distortion and calibration for ring oscillator VCO ADCs}},
  url          = {{http://doi.org/10.1109/tcsii.2024.3370121}},
  volume       = {{71}},
  year         = {{2024}},
}
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