1. A Charge-Sharing-Based Two-Phase Charging Scheme for Zero-Crossing-Based Integrator Circuits
- Author
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Dong-Jick Min and Jae Hoon Shim
- Subjects
Computer Networks and Communications ,Computer science ,delta-sigma modulator ,zero-crossing-based integrator ,lcsh:TK7800-8360 ,02 engineering and technology ,Delta-sigma modulation ,Charge sharing ,Hardware_GENERAL ,Hardware_INTEGRATEDCIRCUITS ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Electrical and Electronic Engineering ,Electronic circuit ,lcsh:Electronics ,020208 electrical & electronic engineering ,Bandwidth (signal processing) ,020206 networking & telecommunications ,switched-capacitor ,Zero crossing ,Switched capacitor ,CMOS ,Hardware and Architecture ,Control and Systems Engineering ,Modulation ,Integrator ,Signal Processing ,low-power design ,Efficient energy use - 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&ndash, oxide&ndash, 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 µ, W. 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.
- Published
- 2019
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