General Stability of Stepwise Waveform of an Adiabatic Charge Recycling Circuit With Any Circuit Topology

Nakata, Shunji; Honda, Ryota; Makino, Hiroshi; Mutoh, S.; Matsuda, Yoshihisa

doi:10.1109/tcsi.2012.2189054

Cited by 13 publications

(6 citation statements)

References 29 publications

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“…The switched‐cap adiabatic circuits are stable [5]; therefore, the steady‐state capacitor voltages at the beginning of each charging process can simply be calculated using circuit theory laws. The steady‐state values are calculated for N = 2, N = 3 with consideration of C 1… N = 1 and C L = a as shown in Table 2.…”

Section: Measurement and Simulation Resultsmentioning

confidence: 99%

“…Table 1 shows that the FOM of the proposed work is superior to the conventional reverse charging method owing to a higher speed which is based on the fact that the charging is not followed by the reverse charging process. Measurement and simulation results: The switched-cap adiabatic circuits are stable [5]; therefore, the steady-state capacitor voltages at the beginning of each charging process can simply be calculated using circuit theory laws. The steady-state values are calculated for N = 2, N = 3 with consideration of C 1…N = 1 and C L = a as shown in Table 2.…”

Section: Conventional Methods Characteristicsmentioning

confidence: 99%

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One‐dimensional adiabatic circuits with inherent charge recycling

Khorami¹,

Sharifkhani²

2015

Electron. lett.

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A new switching method for the stabilisation of a one-dimensional capacitor array tank for the stepwise charging of a load capacitor is presented. In this method, the tank capacitor configuration is rearranged in a circular manner once the charging process of a load capacitor finishes and before the charging process of a new load capacitor begins. Unlike previously reported methods, this method does not require backward switching for the stabilisation of tank capacitor voltages. Hence, the proposed method reduces the number of charging process steps by a factor of up to 2 compared with the conventional method. Moreover, since the tank recycles its charge inherently, the capacitive load can retain its charge after the charging process finishes without the problem of instability. Systematic MATLAB simulation, post-layout simulation in 0.18 μm technology and a fabricated printed circuit board prove the benefits of the proposed method and the provided analytical derivations.

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Section: Measurement and Simulation Resultsmentioning

confidence: 99%

Section: Conventional Methods Characteristicsmentioning

confidence: 99%

One‐dimensional adiabatic circuits with inherent charge recycling

Khorami¹,

Sharifkhani²

2015

Electron. lett.

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“…We also assume that k 1 T , k 2 T ( 1. From (26), I f is approximately zero. From (31), I 0 f is also approximately zero.…”

Section: Stepwise Adiabatic Chargingmentioning

confidence: 98%

Analysis of Voltage, Current and Energy Dissipation of Stepwise Adiabatic Charging of a Capacitor Using a Nonresonant Inductor Current

Nakata

Makino

Honda

et al. 2014

J CIRCUIT SYST COMP

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This paper describes characteristics of stepwise adiabatic charging with an inductor current by controlling switching transistors. An exact analytical resolution is obtained by using a vector comprising a voltage and a current. From a matrix calculation, the voltage and current can be written with solutions of the characteristic equation, power supply voltage, the switching ratio in the switching transistor circuit, and the number of switchings. Using the expression, the voltage and current in the stepwise adiabatic charging method can be derived clearly. As a result, it is clarified analytically that, in N-step charging, the current is reduced to 1/N so that the energy dissipation is reduced to 1/N. Next, the experimental switching transistor circuit with the controller is described, which is composed of discrete ICs. The experimental inductor current in the circuit is investigated. The measured current is reduced to 1/N in N-step charging, which is consistent with the simulated one from the theory. It is also confirmed experimentally from the average power supply current that power consumption is reduced to 1/N.

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“…However, the ratio between tankcapacitors and the equalizing capacitor used in the step charging circuit is 300. The authors in [24] have presented a step charging circuit and the stability of the step charging circuit is considered. It has been mentioned in the paper that the step charging circuit stays stable even if the value of the load capacitor changes significantly when the size of the tankcapacitor is much larger than the load capacitor.…”

Section: Introductionmentioning

confidence: 99%

Energy efficiency of 2-step charging power-clock for adiabatic logic

Raghav

Bartlett

Kale

2016

2016 26th International Workshop on Power and Timing Modeling, Optimization and Simulation (PATMOS)

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obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.The WestminsterResearch online digital archive at the University of Westminster aims to make the research output of the University available to a wider audience. Copyright and Moral Rights remain with the authors and/or copyright owners.Whilst further distribution of specific materials from within this archive is forbidden, you may freely distribute the URL of WestminsterResearch: ((http://westminsterresearch.wmin.ac.uk/).In case of abuse or copyright appearing without permission e-mail repository@westminster.ac.uk Abstract-The generation of power-clocks in adiabatic integrated circuits is investigated. Specifically, we consider the energy efficiency of a 2-step charging strategy based on a single tank-capacitor circuit. We have investigated the impact of various parameters such as tank-capacitance to load capacitance ratio, ramping time, transistors sizing and power supply voltage scaling on energy recovery achievable in the 2-step charging circuit. We show that energy recovery achievable depends on the tank-capacitor and load capacitor size concluding that tankcapacitance (CT) versus load capacitance (CL) is the significant parameter. We also show that the energy performance depends on the ramping time and improves for higher ramping times (lower frequencies). Energy recovery also improves if the transistors sizes in the step charging circuit are sized at their minimum dimensions. Lastly, we show that energy recovery decreases as the power supply voltage is scaled down. Specifically, the decrease in the energy recovery with decreasing power supply is significant for lower ramping times (higher frequencies). We propose that a CT/CL ratio of 10, keeping the width of the transistors in the step charging circuit minimum, can be chosen as a convenient 'rule-of-thumb' in practical designs.

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General Stability of Stepwise Waveform of an Adiabatic Charge Recycling Circuit With Any Circuit Topology

Cited by 13 publications

References 29 publications

One‐dimensional adiabatic circuits with inherent charge recycling

One‐dimensional adiabatic circuits with inherent charge recycling

Analysis of Voltage, Current and Energy Dissipation of Stepwise Adiabatic Charging of a Capacitor Using a Nonresonant Inductor Current

Energy efficiency of 2-step charging power-clock for adiabatic logic

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