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A chopper-stabilized source follower coupling based low-pass filter with noise reduction

  • Mixed Signal Letter
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Abstract

A highly compact source follower coupling based low-pass filter (LPF) topology is proposed that synthesizes a 3rd-order low-pass transfer function in a single stage with no use of operational amplifiers. Chopper stabilization technique is utilized to reduce 1/f noise for minimizing the in-band integrated noise. Implemented and simulated in a 0.18 μm CMOS process, the 3rd-order LPF achieves a − 3 dB bandwidth of 20 MHz with a 280 μA total current from a 1.4 V supply voltage, defining a power-per-pole/bandwidth efficiency of 6.5 μW/MHz. The output noise density at low frequencies is largely reduced with chopper stabilization technique. The integrated output noise from 10 kHz to 2 MHz is minimized from 22.47 to 7.04 μVrms, with a 10.1 dB improvement. The averaged output noise density over the filter bandwidth is 9.4 nV/√Hz, which is mostly contributed by thermal noise of transistors.

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References

  1. Xu, Y., Leuenberger, S., Venkatachala, P., & Moon, U. (2016). A 0.6 mW 31 MHz 4th-order low-pass filter with +29 dBm IIP3 using self-coupled source follower based biquads in 0.18 μm CMOS. In IEEE symposium on VLSI circuits, pp. 132 − 133. https://doi.org/10.1109/vlsic.2016.7573507.

  2. Enz, C., & Temes, G. (1996). Circuit techniques for reducing the effects of op-amp imperfections: Autozeroing, correlated double sampling, and chopper stabilization. Proceedings of the IEEE, 84(11), 1584–1614. https://doi.org/10.1109/5.542410.

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Acknowledgements

Funding was provided by Semiconductor Research Corporation (Grant No. 2550.021).

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Authors and Affiliations

  1. School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR, 97331, USA

    Yang Xu & Un-Ku Moon

Authors
  1. Yang Xu
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  2. Un-Ku Moon
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Correspondence to Yang Xu.

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Xu, Y., Moon, UK. A chopper-stabilized source follower coupling based low-pass filter with noise reduction. Analog Integr Circ Sig Process 95, 365–369 (2018). https://doi.org/10.1007/s10470-018-1185-6

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  • DOI: https://doi.org/10.1007/s10470-018-1185-6

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