Advertisement

An improved adaptive DFE structure based on ISI detection

  • Asghar BabazadehEmail author
  • Tohid Moradi Khanshan
  • Arash Esmaili
Article
  • 6 Downloads

Abstract

An adaptive decision feedback equalizer (DFE) in 0.18 µm CMOS process for 2.5 GB/s data rate is proposed in this paper which is comprised of three taps. Adaptive DFE circuit is used for the purpose of automatic inter-symbol interference cancellation in cords with different lengths. The status of the high frequency components and low frequency components (LFC) of the signal adjust the coefficient of each tap continuously in online manner. In order to extract the clock, the clock and data recovery circuit is interfused within the DFE. Using the proposed DFE, the status of eye diagram varies from the almost closed to wide open. Total power consumption of the receiver circuit is approximately 50 mW and it occupies the area about 350 µm × 350 µm. Simplicity and less hardware requirements are features of the designed circuit in comparison with the similar circuits.

Keywords

Decision feedback equalizer (DFE) ISI detector Adaptive equalizer Low frequency components (LFC) High frequency components (HFC) 

Notes

References

  1. 1.
    Emami-Neyestanak, A., Varzaghani, A., Bulzacchelli, J., Rylyakov, A., Ken Yang, Ch., & Friedman, D. (2007). A 6.0-mW 10.0-Gb/s receiver with switched-capacitor summation DFE. IEEE Journal of Solid-State Circuits, 42(4), 889–896.CrossRefGoogle Scholar
  2. 2.
    Lee, J. (2006). A 20-Gb/s adaptive equalizer in 0.13-um CMOS technology. IEEE Journal of Solid-State Circuits, 41(9), 2058–2066.CrossRefGoogle Scholar
  3. 3.
    Jackie Wong, K., Rylyakov, A., & Ken Yang, Ch. (2007). A 5-mW 6-Gb/s quarter-rate sampling receiver with a 2-tap DFE using soft decisions. IEEE Journal of Solid-State Circuits, 42(4), 881–888.CrossRefGoogle Scholar
  4. 4.
    Kim, B., Liu, Y., Dickson, T., Bulzacchelli, J., & Friedman, D. (2009). A 10-Gb/s compact low-power serial I/O with DFE-IIR equalization in 65-nm CMOS. IEEE Journal of Solid-State Circuits, 44(12), 3526–3538.CrossRefGoogle Scholar
  5. 5.
    Wang, H., & Lee, J. (2010). A 21-Gb/s 87-mW transceiver with FFE/DFE/analog equalizer in 65-nm CMOS technology. IEEE Journal of Solid-State Circuits, 45(4), 909–920.CrossRefGoogle Scholar
  6. 6.
    Proakis, J. (2007). Digital communications (4th ed., p. 621). New York: McGraw-Hill Education.Google Scholar
  7. 7.
    Moradi, T., Naghavi, S., Nematzade, M., Hadidi, Kh, Abrishamifar, A., & Khoei, A. (2014). A fast and low settling error continuous-time common-mode feedback circuit based in differential difference amplifier. Journal of Circuits, Systems, and Computers, 1, 1.  https://doi.org/10.1142/S0218126614500650.Google Scholar
  8. 8.
    Gondi, S., & Razavi, B. (2007). Equalization and clock and data recovery techniques for 10-Gb/s CMOS serial-link receivers. IEEE Journal of Solid-State Circuits, 42(9), 1999–2011.CrossRefGoogle Scholar
  9. 9.
    Kim, Y. H., Kim, Y. J., Lee, T. H., & Kim, L. S. (2015). An 11.5 Gb/s 1/4th baud-rate CTLE and two-tap DFE with boosted high frequency gain in 110-nm CMOS. IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 23(3), 588–592.CrossRefGoogle Scholar
  10. 10.
    Seong, Ch K, Rhim, J., & Choi, W. Y. (2012). A 10-Gb/s adaptive look-ahead decision feedback equalizer with an eye-opening monitor. IEEE Transactions on Circuit and Systems—II: Express Briefs, 59(4), 209–213.Google Scholar
  11. 11.
    Al-Taee, A. R., Yuan, F., & Ye, A. (2015). Adaptive decision feedback equalizer with hexagon EOM and jitter detection. Circuits, Systems, and Signal Processing(CSSP), 37(5), 2487–2501.Google Scholar
  12. 12.
    Yong-Hun, K., Young-Ju, K., Taeho, L., & Lee-Sup, K. (2015). A 21-Gbit/s 1.63-pJ/bit adaptive CTLE and one-tap DFE with single loop spectrum balancing method. IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 24(2), 789–793.Google Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Urumi Graduate InstituteUrmiaIran
  2. 2.Department of InformaticsThe University of OsloOsloNorway
  3. 3.Faculty of Electrical Engineering, Urmia University of TechnologyUrmiaIran

Personalised recommendations