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Analog Integrated Circuits and Signal Processing

, Volume 98, Issue 2, pp 243–256 | Cite as

An enhanced fast-settling recycling folded cascode Op-Amp with improved DC gain in 90 nm CMOS process

  • Ghader YosefiEmail author
Article
  • 41 Downloads

Abstract

Proposed in this paper is design and analysis of an enhanced recycling folded cascode (RFC) Op-Amp. This structure is achieved using connecting two nodes and eliminating some devices in the conventional RFC. This effect enhances the DC gain with increasing output resistance of differential pair compared to the conventional RFC circuit. In the same − 3 dB frequency, the unity gain bandwidth is also increased. Moreover, for the same slew rate and input referred noise performance, other proposed improvements are the fast-settling time and total harmonic distortion. Hspice simulation results in 90 nm CMOS standard technology demonstrate that the proposed amplifier has 1.2 times the unity gain bandwidth (190 vs. 160 MHz) and also has twice gain boosting (66.2 vs. 59.5 dB) in the same − 3 dB frequency, power supply (1.2 V) and driving capacitor load of 5 pF.

Keywords

Gain boosting CMOS recycling folded cascode Op-Amp Unity gain bandwidth 

Notes

Acknowledgements

The authors would like to thank all people involved in this research work for their kind and responsible assistance special to Dr. Mahdi Mottaghi and Prof. Kh. Hadidi.

References

  1. 1.
    Pugliese, A., Amoroso, F. A., Cappuccino, G., & Cocorullo, G. (2010). Analysis of op-amp phase margin impact on SC ΣΔ modulator performance. Research Article Microelectronics Journal, 41(7), 440–446.CrossRefGoogle Scholar
  2. 2.
    Mirhaj, S. A., Shirazi, A. N., Ashtiani, S. J., & Shoaei, O. (2011). High speed sample and hold design using closed-loop pole-zero cancelation. Microelectronics Journal, 42(12), 1353–1358.CrossRefGoogle Scholar
  3. 3.
    Wakaumi, H. (2017) A switched-capacitor filter with dynamic switching bias OP amplifiers. In 2017 IEEE 8th latin American symposium on circuits and systems (LASCAS) (pp. 1–4).Google Scholar
  4. 4.
    Zarifi, M. H., Frounchi, J., Tinati, M. A., Farshchi, S., & Judy, J. W. (2011). A low-power small-area 10-bit analog-to-digital converter for neural recording applications. International Journal of Circuit Theory and Applications, 39(4), 385–395.CrossRefGoogle Scholar
  5. 5.
    Razavi, B. (2001). Design of analog CMOS integrated circuits. New York: McGraw-Hill.Google Scholar
  6. 6.
    Kashtiban, M. M., Hadidi, kh., & Khoei, A. (2006). Modified CMOS op-amp with improved gain and bandwidth. In IEICE transactions on electronics (Vol. E89–C, No. 6).Google Scholar
  7. 7.
    Dadashi, A., Alizadeh, B. (2011). An enhanced folded cascode op-amp in 0.18 µm CMOS process with 67 dB dc-gain. In IEEE conference publications of faible tension faible consommation (FTFC) (pp. 87 –90).  https://doi.org/10.1109/ftfc.2011.5948926.
  8. 8.
    Dadashi, A., Sadrafshari, S., Hadidi, Kh, & Khoei, A. (2011). An enhanced folded cascode op-amp using positive feedback and bulk amplification in 0.35 um CMOS process. Journal of Analog Integrated Circuits and Signal Processing, 67(2), 213–222.CrossRefGoogle Scholar
  9. 9.
    Dadashi, A. (2013). Modified telescopic amplifier with improved DC gain in 0.18 mm CMOS process. International Journal of Circuit Theory and Applications, 41(8), 818–830.CrossRefGoogle Scholar
  10. 10.
    Kulej, T. (2015). 0.5-V bulk-driven OTA and its applications. International Journal of Circuit Theory and Applications, 43(2), 187–204.CrossRefGoogle Scholar
  11. 11.
    Monsurr, P., Pennisi, S., Scotti, G., & Trifiletti, A. (2009). 0.9-V CMOS cascode amplifier with body-driven gain boosting. International Journal of Circuit Theory and Applications, 37(2), 193–202.CrossRefGoogle Scholar
  12. 12.
    Assaad, R., & Martinez, J. S. (2007). Enhancing general performance of folded cascode amplifier by recycling current. Electronics letters year: 2007 (Vol. 43, No. 23). Cited by: Papers (7).Google Scholar
  13. 13.
    Assaad, R. S., & Martinez, J. S. (2009). The recycling folded cascode: A general enhancement of the folded cascode amplifier. IEEE Journal of Solid-State Circuits, 44, 9.CrossRefGoogle Scholar
  14. 14.
    Mak, P. I., Liu, M., Zhao, Y., & Martins, R. P. (2014). Enhancing the performances of recycling folded cascode opamp in nanoscale CMOS through voltage supply doubling and design for reliability. International Journal of Circuit Theory and Applications, 42(6), 605–619.CrossRefGoogle Scholar
  15. 15.
    Akbari, M., & Hashemipour, O. (2017). A 63-dB gain OTA operating in subthreshold with 20-nW power Consumption. International Journal of Circuit Theory and Applications, 45(6), 843–850.CrossRefGoogle Scholar
  16. 16.
    Akbari, M., Hashemipour, O., & Javid, A. (2014). An ultra-low voltage, ultra-low power fully recycling folded cascode amplifier. In The 22nd Iranian conference on electrical engineering (ICEE 2014), May 2022, 2014 (pp. 514–518). Shahid Beheshti University.Google Scholar
  17. 17.
    Akbari, M., Biabanifard, S., Asadi, S., & Yagoub, M. C. E. (2014). Design and analysis of DC gain and transconductance boosted recycling folded cascode OTA. AEU: International Journal of Electronics and Communications, 68(11), 1047–1052.Google Scholar
  18. 18.
    Zhang, Q., Zhao, X., Zhang, X., & Zhang, Q. (2017). Multipath recycling method for transconductance enhancement of folded cascade amplifier. AEU: International Journal of Electronics and Communications, 72, 1–7.Google Scholar
  19. 19.
    Aghaee, T., Biabanifard, S., & Golmakani, A. (2017). Gain boosting of recycling folded cascode OTA using positive feedback and introducing new input path. Analog Integrated Circuits and Signal Processing, 90(1), 237–246.CrossRefGoogle Scholar
  20. 20.
    Kuo, P. Y., Tsai, S. D. (2017). A compensation technique for recycling folded-cascode amplifier. In 2017 IEEE international conference on consumer electronics-Taiwan (ICCE-TW). Google Scholar
  21. 21.
    Zhao, X., Zhang, Q., Wang, Y., & Deng, M. (2016). Transconductance and slew rate improvement technique for current recycling folded cascode amplifier. AEU: International Journal of Electronics and Communications, 70(3), 326–330.Google Scholar
  22. 22.
    Akbari, M., Biabanifard, S., Asadi, S., & Yagoub, M. C. E. (2015). High performance folded cascode OTA using positive feedback and recycling structure”. Analog Integrated Circuits and Signal Processing, 82(1), 217–227.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Electrical Electronics Engineering, Mahabad BranchIslamic Azad UniversityMahabadIran

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