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Widely tunable low-pass gm  − C filter for biomedical applications

Widely tunable low-pass gm  − C filter for biomedical applications

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This study presents a fourth-order, low-pass Butterworth transconductor–capacitor filter with tunable bandwidth for biomedical signal processing front-ends. An architecture has been proposed for realising very low transconductance values with tunability. This transconductor architecture makes it possible to realise a fully differential filter without the need for explicit common-mode feedback circuit. The filter has two tuning schemes, a resistor-based tuning (R-tuning) and a switched transconductor-based tuning (D-tuning). With R-tuning, the bandwidth is adjustable between 1 and 70 Hz and with D-tuning, the tuning range is 30 mHz–100 Hz. The filter has been designed in united microelectronics corporation (UMC) 0.18 µm complementary metal–oxide–semiconductor process. In terms of figure-of-merit, the proposed filter is found to be on par with the filters reported in the literature.

References

    1. 1)
      • 1. Harrison, R.R.: ‘A versatile integrated circuit for the acquisition of biopotentials’. Proc. Custom Integrated Circuits Conf., San Jose, CA, USA, September 2007, pp. 115122.
    2. 2)
      • 2. Nagaraj, K.: ‘A parasitic-insensitive area-efficient approach to realizing very large time constants in switched-capacitor circuits’, IEEE Trans. Circuits Syst., 1989, 36, (9), pp. 12101216.
    3. 3)
      • 3. Solis-Bustos, S., Silva-Martinez, J., Maloberti, F., et al: ‘A 60 dB dynamic-range CMOS sixth-order 2.4 Hz low-pass filter for medical applications’, IEEE Trans. Circuits Syst. II, Analog Digit. Signal Process., 2000, 47, (12), pp. 13911398.
    4. 4)
      • 4. Veeravalli, A., Sanchez-Sinencio, E., Silva-Martinez, J.: ‘Transconductance amplifier structures with very small transconductances: a comparative design approach’, IEEE J. Solid-State Circuits, 2002, 37, (6), pp. 770775.
    5. 5)
      • 5. Zhou, L., Chakrabartty, S.: ‘Design of low-Gm transconductors using varactor-based degeneration and linearization technique’. Proc. IEEE Biomedical Circuits and Systems Conf. (BioCAS), Atlanta, USA, October 2015, pp. 14.
    6. 6)
      • 6. Silva-Martinez, J., Salcedo-Suner, J.: ‘IC voltage to current transducers with very small transconductance’, Analog Integr. Circuits Signal Process., 1997, 13, (3), pp. 285293.
    7. 7)
      • 7. Alioto, M.: ‘Understanding DC behavior of subthreshold CMOS logic through closed-form analysis’, IEEE Trans. Circuits Syst. I, Regul. Pap., 2010, 57, (7), pp. 15971607.
    8. 8)
      • 8. Akbari, M., Hashemipour, O., Moradi, F.: ‘Input offset estimation of CMOS integrated circuits in weak inversion’, IEEE Trans. Very Large Scale Integr. (VLSI) Syst., 2018, 26, (9), pp. 18121816.
    9. 9)
      • 9. Chang, C.M.: ‘New multifunction OTA-C biquads’, IEEE Trans. Circuits Syst. II, Analog Digit. Signal Process., 1999, 46, (6), pp. 820824.
    10. 10)
      • 10. Schaumann, R., Valkenburg, M.E.V.: ‘Design of analog filters’ (Oxford University press, USA, 2001).
    11. 11)
      • 11. Rodriguez-Villegas, E., Casson, A.J., Corbishley, P.: ‘A subhertz nanopower low-pass filter’, IEEE Trans. Circuits Syst. II, Express Briefs, 2011, 58, (6), pp. 351355.
    12. 12)
      • 12. Veeravalli, A., Sanchez-Sinencio, E., Silva-Martinez, J.: ‘A CMOS transconductance amplifier architecture with wide tuning range for very low frequency applications’, IEEE J. Solid-State Circuits, 2002, 37, (6), pp. 776781.
    13. 13)
      • 13. Lee, S.Y., Cheng, C.J.: ‘Systematic design and modeling of an OTA-C filter for portable ECG detection’, IEEE Trans. Biomed. Circuits Syst., 2009, 3, (1), pp. 5364.
    14. 14)
      • 14. Bronzino, J.D.: ‘Medical devices and systems’ (CRC press, Boca Raton, Florida, USA., 2006, 3rd edn.).
    15. 15)
      • 15. Lo, T.-Y., Hung, C.-C.: ‘A wide tuning range GmC continuous-time analog filter’, IEEE Trans. Circuits Syst. I, Regul.Pap., 2007, 54, (4), pp. 713722.
    16. 16)
      • 16. Liu, Y.T., Lie, D.Y.C., Hu, W., et al: ‘An ultralow-power CMOS transconductor design with wide input linear range for biomedical applications’. Proc. IEEE Int. Symp. Circuits and Systems (ISCAS), Seoul, Korea (South), May 2012, pp. 22112214.
    17. 17)
      • 17. Mahmoud, S., Bamakhramah, A., Al-Tunaiji, S.: ‘Low-noise low-pass filter for ECG portable detection systems with digitally programmable range’, Circuits Syst. Signal Process. J., 2013, 32, (9), pp. 20292045.
    18. 18)
      • 18. Richa, A., Oliveira, J.P.: ‘Gm−C biquad filter for low signal sensor applications’. Proc. MIXDES-23rd Int. Conf. Mixed Design of Integrated Circuits and Systems, Poland, 2016, pp. 207210.
    19. 19)
      • 19. Sun, C.-Y., Lee, S.-Y.: ‘A fifth-order Butterworth OTA-C LPF with multiple-output differential-input OTA for ECG applications’, IEEE Trans. Circuits Syst. II, Express Briefs, 2017, 65, (4), pp. 421425.
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