A fully integrated battery-connected switched-capacitor 4:1 voltage regulator with 70% peak efficiency using bottom-plate charge recycling

Tong, Tao; Zhang, Xuan; Kim, Wonyoung; Brooks, David; Wei, Gu-Yeon

doi:10.1109/cicc.2013.6658485

Cited by 20 publications

(5 citation statements)

References 7 publications

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“…The dynamic power loss correlated to the bottom plate parasitic is another major cause for low power efficiency. The charge recycling or charge sharing between bottom layer and substrate parasitic has been studied in [11,12] to minimise the loss.…”

Section: Challenge and Contribution 2: Charge Recycling To Reduce Botmentioning

confidence: 99%

Energy-Efficient Start-up Dickson Charge Pump for Batteryless Biomedical Implant Devices

Htet

Heidari

Moradi

et al. 2020

2020 27th IEEE International Conference on Electronics, Circuits and Systems (ICECS)

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This paper presents a power management concept for solar energy harvesting power management using an on-chip switched-capacitor (SC) DC-DC converter for biomedical implantable applications. This design eliminates potential reversion losses caused by the switching scheme. It also mitigates the bottom plate loss by employing the charge recycling technique. Moreover, instead of using a single step clock pulse, the two-step adiabatic charge sharing clock helps reduce the energy drawn from the PV cell by 65%. Furthermore, with the help of clock disabler scheme, the power dissipation has been further reduced by disabling the entire start-up charge pump once the desired reference output voltage was reached. However, due to additional circuitry for the clock disabler, there is a tradeoff between power efficiency and power dissipation. The proposed system was implemented and fabricated in a standard 0.18-μm TSMC RF CMOS technology. The proposed converter has achieved a maximum efficiency of 73%.

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Section: Challenge and Contribution 2: Charge Recycling To Reduce Botmentioning

confidence: 99%

Energy-Efficient Start-up Dickson Charge Pump for Batteryless Biomedical Implant Devices

Htet

Heidari

Moradi

et al. 2020

2020 27th IEEE International Conference on Electronics, Circuits and Systems (ICECS)

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“…Recent technology advancements [5,11] make it possible for switching regulators to operate at much higher frequencies and to be integrated on the same die as the processors. Buck converters [13] and switched-capacitor converters [4,5,14] are two types of topology commonly adopted for such IVRs, in addition to low dropout linear regulators (LDO). While buck converter requires both an inductor and a capacitor, it can sustain a relatively constant conversion efficiency over a wider output range.…”

Section: Integrated Voltage Regulatormentioning

confidence: 99%

“…Given that these points are non-functional and are mostly likely caused by aggravated leakage current when the power switch exceeds its intended operating range, we conclude that Ivory is sufficiently accurate over the realistic, functional range of operation. Data points on the right plot were generated by SPICE simulations of two sets of 2:1 and 3:1 switched-capacitor converter designs in 40nm CMOS process [4]. Regular CMOS capacitors are used for the low-power density design, whereas embedded trench capacitors [5] are used for the high-power density design.…”

Section: Model Validationmentioning

confidence: 99%

“…Leveraging these benefits improves both performance and efficiency. Also, IVR solutions save precious board/package area compared to bulky off-chip regulators with large discrete passive components, making them especially attractive for mobile SoCs [4]. As IVR becomes a viable solution for power delivery in modern microprocessors, it is important to explore various design alternatives and thoroughly evaluate their impacts on performance and efficiency at the system-level.…”

Section: Introductionmentioning

confidence: 99%

“…The benefits of integrated fine-grain voltage regulation [2] have precipitated recent advancements in device fabrication [5,11], circuit implementation [4,12], and system integration of IVR [6,8]. In this section, we review the current state of IVR design and implementation, especially in the context of the entire power delivery system of modern processors.…”

Section: Introductionmentioning

confidence: 99%

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Ivory

Zou

Leng

et al. 2017

Proceedings of the 54th Annual Design Automation Conference 2017

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Despite being employed in burgeoning efforts to improve power delivery efficiency, integrated voltage regulators (IVRs) have yet to be evaluated in a rigorous, systematic, or quantitative manner. To fulfill this need, we present Ivory, a high-level design space exploration tool capable of providing accurate conversion efficiency, static performance characteristics, and dynamic transient responses of an IVR-enabled power delivery subsystem (PDS), enabling rapid trade-off exploration at early design stage, approximately 1000x faster than SPICE simulation. We demonstrate and validate Ivory with a wide spectrum of IVR topologies. In addition, we present a case study using Ivory to reveal the optimal PDS configurations, with underlying power breakdowns and area overheads for the GPU manycore architecture, which has yet to embrace IVRs.

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Integrated Passives

Renz¹,

Wicht²

2020

Integrated Hybrid Resonant DCDC Converters

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A fully integrated battery-connected switched-capacitor 4:1 voltage regulator with 70% peak efficiency using bottom-plate charge recycling

Cited by 20 publications

References 7 publications

Energy-Efficient Start-up Dickson Charge Pump for Batteryless Biomedical Implant Devices

Energy-Efficient Start-up Dickson Charge Pump for Batteryless Biomedical Implant Devices

Ivory

Integrated Passives

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