Skip to main content
SpringerLink
Log in

An opamp-free second-order noise-shaping SAR ADC with 4\(\times\) passive gain using capacitive charge pump

  • Mixed Signal Letter
  • Published:
Analog Integrated Circuits and Signal Processing Aims and scope Submit manuscript

Abstract

This paper presents a compact and robust opamp-free noise shaping (NS) successive approximation register (SAR) analog-to-digital converter (ADC). The proposed NS SAR ADC adopts extra one passive feed-forward path summing in realizing second-order noise shaping with the minimum modification to a standard SAR. Compared with previous works, the noise sources of residue sampling and first-order integration on filter capacitors are obviated. It implements 4\(\times\) passive gain by capacitive charge-pump techniques that compensates the partial loss of residue voltage and relaxes the specifications of comparator. According to the behavioral modeling and simulation results, an ENOB of 16.88-bit is achieved based on a 10-bit DAC array, at the OSR of 16. Through utilizing the Monte Carlo simulation, the proposed ADC architecture is proven to be a robust system.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 13
Fig. 14

References

  1. Fredenburg, J. A., & Flynn, M. P. (2012). A 90-ms/s 11-mhz-bandwidth 62-db sndr noise-shaping sar adc. IEEE Journal of Solid-State Circuits, 47, 2898–2904.

    Article  Google Scholar 

  2. Chen, Z., Miyahara, M., & Matsuzawa, A. (2016). A 2 nd order fully-passive noise-shaping SAR ADC with embedded passive gain. In 2016 IEEE Asian Solid-State Circuits Conference (A-SSCC) (pp. 309–312).

  3. Chen, Z., Miyahara, M., & Matsuzawa, A. (2016). A 9.35-ENOB, 14.8 fJ/conv.-step fully-passive noise-shaping SAR ADC. IEICE Transactions on Electronics, 99, 963–973.

    Article  Google Scholar 

  4. Guo, W.n, Zhuang, H., & Sun, N. (2017). A 13b-ENOB 173dB-FoM 2 nd-order NS SAR ADC with passive integrators. In 2017 Symposium on VLSI Ccrcuits (pp. C236–C237).

  5. Ghaedrahmati, H., & Zhou, J. (2018). A 90-ms/s 160 MS/s 20 MHz bandwidth third-order noise shaping SAR ADC. Electronics Letters, 54, 128–130.

    Article  Google Scholar 

  6. Liu, J., Li, S., Guo, W., Wen, G., & Sun, N. (2018). A 0.029-mm 2 17-fJ/conversion-step third-order CT \(\Delta \Sigma\) ADC with a single OTA and second-order noise-shaping SAR quantizer. IEEE Journal of Solid-State Circuits, 54, 428–440.

    Article  Google Scholar 

  7. Payandehnia, P., Mirzaie, H., Maghami, H., Muhlestein, J., & Temes, G. (2017). Fully passive third-order noise shaping SAR ADC. Electronics Letters, 53, 528–530.

    Article  Google Scholar 

Download references

Acknowledgements

The authors would like to thank J. Liu for useful discussion. This work was supported in part by the National Natural Science Foundation of China (Grant No. 61832007) and the National Key R&D Program of China (Grant No. 2018YFB1003304).

Author information

Authors and Affiliations

  1. State Key Laboratory of High Performance Computing, College of Computer, National University of Defense Technology, Changsha, 410073, China

    Pinyun Yi & Liang Fang

  2. School of Microelectronics, Xidian University, Xi’an, 710071, China

    Zhangming Zhu & Dengquan Li

Authors
  1. Pinyun Yi
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Zhangming Zhu
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Dengquan Li
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Liang Fang
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Pinyun Yi.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Yi, P., Zhu, Z., Li, D. et al. An opamp-free second-order noise-shaping SAR ADC with 4\(\times\) passive gain using capacitive charge pump. Analog Integr Circ Sig Process 105, 125–133 (2020). https://doi.org/10.1007/s10470-020-01699-6

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10470-020-01699-6

Keywords

Search

Navigation