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A mostly digital VCO-based CT-SDM with third-order noise shaping

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Abstract
This paper presents the architectural concept and implementation of a mostly digital voltage-controlled oscillator-analog- to-digital converter (VCO-ADC) with third-order quantization noise shaping. The system is based on the combination of a VCO and a digital counter. It is shown how this combination can function as a continuous-time integrator to form a high-order continuous-time sigma-delta modulator (CT-SDM). The counter consists only of digital building blocks, and the VCOs are implemented using ring oscillators, which are also digital-friendly. No traditional analog blocks, such as opamps, OTAs, or comparators, are used. As a proof of concept, we have implemented a third-order VCO-based CT-SDM for a 10-MHz bandwidth in the low-power version of a 65-nm CMOS technology. This prototype shows a measured performance of 71/66.2/62.5-dB DR/SNR/SNDR at a 10-MHz bandwidth while consuming 1.8 mW from a 1.0-V analog and 1.9 mW from a 1.2-V digital supply. With digital calibration, the nonlinearity could be pushed below the noise level, leading to an improved peak SNDR of 66 dB.
Keywords
Analog-to-digital converter (ADC), low-voltage design, quantization noise shaping, ring oscillator, sigma-delta modulator, time-domain signal processing, voltage-controlled oscillator (VCO)

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MLA
Babaie-Fishani, Amir, and Pieter Rombouts. “A Mostly Digital VCO-Based CT-SDM with Third-Order Noise Shaping.” IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 52, no. 8, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017, pp. 2141–53, doi:10.1109/JSSC.2017.2688364.
APA
Babaie-Fishani, A., & Rombouts, P. (2017). A mostly digital VCO-based CT-SDM with third-order noise shaping. IEEE JOURNAL OF SOLID-STATE CIRCUITS, 52(8), 2141–2153. https://doi.org/10.1109/JSSC.2017.2688364
Chicago author-date
Babaie-Fishani, Amir, and Pieter Rombouts. 2017. “A Mostly Digital VCO-Based CT-SDM with Third-Order Noise Shaping.” IEEE JOURNAL OF SOLID-STATE CIRCUITS 52 (8): 2141–53. https://doi.org/10.1109/JSSC.2017.2688364.
Chicago author-date (all authors)
Babaie-Fishani, Amir, and Pieter Rombouts. 2017. “A Mostly Digital VCO-Based CT-SDM with Third-Order Noise Shaping.” IEEE JOURNAL OF SOLID-STATE CIRCUITS 52 (8): 2141–2153. doi:10.1109/JSSC.2017.2688364.
Vancouver
1.
Babaie-Fishani A, Rombouts P. A mostly digital VCO-based CT-SDM with third-order noise shaping. IEEE JOURNAL OF SOLID-STATE CIRCUITS. 2017;52(8):2141–53.
IEEE
[1]
A. Babaie-Fishani and P. Rombouts, “A mostly digital VCO-based CT-SDM with third-order noise shaping,” IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 52, no. 8, pp. 2141–2153, 2017.
@article{8529357,
  abstract     = {{This paper presents the architectural concept and implementation of a mostly digital voltage-controlled oscillator-analog- to-digital converter (VCO-ADC) with third-order quantization noise shaping. The system is based on the combination of a VCO and a digital counter. It is shown how this combination can function as a continuous-time integrator to form a high-order continuous-time sigma-delta modulator (CT-SDM). The counter consists only of digital building blocks, and the VCOs are implemented using ring oscillators, which are also digital-friendly. No traditional analog blocks, such as opamps, OTAs, or comparators, are used. As a proof of concept, we have implemented a third-order VCO-based CT-SDM for a 10-MHz bandwidth in the low-power version of a 65-nm CMOS technology. This prototype shows a measured performance of 71/66.2/62.5-dB DR/SNR/SNDR at a 10-MHz bandwidth while consuming 1.8 mW from a 1.0-V analog and 1.9 mW from a 1.2-V digital supply. With digital calibration, the nonlinearity could be pushed below the noise level, leading to an improved peak SNDR of 66 dB.}},
  author       = {{Babaie-Fishani, Amir and Rombouts, Pieter}},
  issn         = {{0018-9200}},
  journal      = {{IEEE JOURNAL OF SOLID-STATE CIRCUITS}},
  keywords     = {{Analog-to-digital converter (ADC),low-voltage design,quantization noise shaping,ring oscillator,sigma-delta modulator,time-domain signal processing,voltage-controlled oscillator (VCO)}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{2141--2153}},
  publisher    = {{IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC}},
  title        = {{A mostly digital VCO-based CT-SDM with third-order noise shaping}},
  url          = {{http://dx.doi.org/10.1109/JSSC.2017.2688364}},
  volume       = {{52}},
  year         = {{2017}},
}

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