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Passive loop filter assistance for CTSDMs

Dries Vercaemer, Johan Raman (UGent) and Pieter Rombouts (UGent)
(2017) IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS. 64(10). p.1157-1161
Author
Organization
Abstract
This brief presents a power reduction technique for continuous time sigma-delta modulators (CTSDMs). The approach consists of two elements. First, a passive low-pass filter is added in front of the modulator's loop filter to reduce the high frequency components in the loop. As a result, the slew rate requirements of the opamps can be greatly reduced which allows a significant power saving. Unfortunately, the insertion of this low-pass filter also changes the modulator's loop gain, and hence affects the noise transfer functions (NTFs) and signal transfer functions (STFs), in an undesired way. Therefore, the second proposed element consists of inserting a compensation branch which is such that the original loop gain, NTF and STF are restored. Thanks to this, our power saving technique is completely transparent on the system level such that all established techniques and toolboxes for CTSDM design can still be used. The technique is especially suited for one-bit CTSDMs, where the amount of high-frequency components in the loop is excessive. To showcase the technique, a self-oscillating sigma-delta modulator (which is a dedicated type of one-bit CTSDM) was implemented in a 65-nm CMOS process. It achieves a peak signal to noise and distortion ratio of 63 dB over a 20-MHz bandwidth at a power consumption of 1.7 mW while occupying a very small chip area of only 0.009 mm(2).
Keywords
SIGMA-DELTA-MODULATORS, FIR FEEDBACK, ADC, Analog-to-digital conversion, continuous time sigma-delta modulator, (CTSDM), low power, pulse-width modulation, self-oscillating sigma-delta, modulator (SOSDM), small area ADC

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MLA
Vercaemer, Dries, et al. “Passive Loop Filter Assistance for CTSDMs.” IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, vol. 64, no. 10, Ieee-inst Electrical Electronics Engineers Inc, 2017, pp. 1157–61, doi:10.1109/TCSII.2016.2633002.
APA
Vercaemer, D., Raman, J., & Rombouts, P. (2017). Passive loop filter assistance for CTSDMs. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 64(10), 1157–1161. https://doi.org/10.1109/TCSII.2016.2633002
Chicago author-date
Vercaemer, Dries, Johan Raman, and Pieter Rombouts. 2017. “Passive Loop Filter Assistance for CTSDMs.” IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 64 (10): 1157–61. https://doi.org/10.1109/TCSII.2016.2633002.
Chicago author-date (all authors)
Vercaemer, Dries, Johan Raman, and Pieter Rombouts. 2017. “Passive Loop Filter Assistance for CTSDMs.” IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 64 (10): 1157–1161. doi:10.1109/TCSII.2016.2633002.
Vancouver
1.
Vercaemer D, Raman J, Rombouts P. Passive loop filter assistance for CTSDMs. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS. 2017;64(10):1157–61.
IEEE
[1]
D. Vercaemer, J. Raman, and P. Rombouts, “Passive loop filter assistance for CTSDMs,” IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, vol. 64, no. 10, pp. 1157–1161, 2017.
@article{8539539,
  abstract     = {{This brief presents a power reduction technique for continuous time sigma-delta modulators (CTSDMs). The approach consists of two elements. First, a passive low-pass filter is added in front of the modulator's loop filter to reduce the high frequency components in the loop. As a result, the slew rate requirements of the opamps can be greatly reduced which allows a significant power saving. Unfortunately, the insertion of this low-pass filter also changes the modulator's loop gain, and hence affects the noise transfer functions (NTFs) and signal transfer functions (STFs), in an undesired way. Therefore, the second proposed element consists of inserting a compensation branch which is such that the original loop gain, NTF and STF are restored. Thanks to this, our power saving technique is completely transparent on the system level such that all established techniques and toolboxes for CTSDM design can still be used. The technique is especially suited for one-bit CTSDMs, where the amount of high-frequency components in the loop is excessive. To showcase the technique, a self-oscillating sigma-delta modulator (which is a dedicated type of one-bit CTSDM) was implemented in a 65-nm CMOS process. It achieves a peak signal to noise and distortion ratio of 63 dB over a 20-MHz bandwidth at a power consumption of 1.7 mW while occupying a very small chip area of only 0.009 mm(2).}},
  author       = {{Vercaemer, Dries and Raman, Johan and Rombouts, Pieter}},
  issn         = {{1549-7747}},
  journal      = {{IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS}},
  keywords     = {{SIGMA-DELTA-MODULATORS,FIR FEEDBACK,ADC,Analog-to-digital conversion,continuous time sigma-delta modulator,(CTSDM),low power,pulse-width modulation,self-oscillating sigma-delta,modulator (SOSDM),small area ADC}},
  language     = {{eng}},
  number       = {{10}},
  pages        = {{1157--1161}},
  publisher    = {{Ieee-inst Electrical Electronics Engineers Inc}},
  title        = {{Passive loop filter assistance for CTSDMs}},
  url          = {{http://doi.org/10.1109/TCSII.2016.2633002}},
  volume       = {{64}},
  year         = {{2017}},
}
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