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A Charge-Sharing-Based Two-Phase Charging Scheme for Zero-Crossing-Based Integrator Circuits

School of Electronics Engineering, Kyungpook National University, Daegu 41566, Korea
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Electronics 2019, 8(7), 821; https://doi.org/10.3390/electronics8070821
Received: 27 June 2019 / Revised: 19 July 2019 / Accepted: 22 July 2019 / Published: 23 July 2019
(This article belongs to the Section Circuit and Signal Processing)
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Abstract

As an effort to improve the energy efficiency of switched-capacitor circuits, zero-crossing- based integrators (ZCBI) that consist of zero-crossing detectors and charging circuits have been proposed. To break the trade-off between accuracy and speed, ZCBI typically employs a two-phase charging scheme that relies on an additional threshold for zero-crossing detection. This paper proposes a simpler realization method of the two-phase charging scheme by means of charge sharing. To demonstrate feasibility of the proposed method, we designed and fabricated a second-order delta-sigma modulator in 180-nm complementary metal–oxide–semiconductor (CMOS) technology. The measurement results show that the modulator exhibits a peak signal-to-noise-and-distortion ratio (SNDR) of 46.3 dB over the bandwidth of 156 kHz with the power consumption of 684 µW. We also designed the same modulator in 65-nm CMOS technology and simulation results imply that the proposed circuit is able to achieve a much better energy efficiency in advanced technology. View Full-Text
Keywords: delta-sigma modulator; switched-capacitor; low-power design; zero-crossing-based integrator delta-sigma modulator; switched-capacitor; low-power design; zero-crossing-based integrator
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Min, D.-J.; Shim, J.H. A Charge-Sharing-Based Two-Phase Charging Scheme for Zero-Crossing-Based Integrator Circuits. Electronics 2019, 8, 821.

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