Design and Analysis of On-Chip Reconfigurable SCVR With Wide Output Voltage Range for SoCs
A comprehensive framework for the analysis and design of reconfigurable two-phase switched-capacitor (SC) dc-dc converters is introduced. Initially, a generalized approach leveraging graph theory and network analysis is presented, enabling the enumeration of all possible ideal conversion ratios for...
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2025-01-01
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| author | Sunita Saini Davinder Singh Saini Vipin Balyan |
| author_facet | Sunita Saini Davinder Singh Saini Vipin Balyan |
| author_sort | Sunita Saini |
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| description | A comprehensive framework for the analysis and design of reconfigurable two-phase switched-capacitor (SC) dc-dc converters is introduced. Initially, a generalized approach leveraging graph theory and network analysis is presented, enabling the enumeration of all possible ideal conversion ratios for a given SC converter topology. This methodology extends the performance boundaries of two-phase SC converters, leading to the proposal of a reconfigurable, two-phase SC dc-dc converter. The proposed converter incorporates a programmable, optimized switching configuration that enhances the number of achievable ideal conversion ratios for a fixed set of capacitors and switching states. This flexibility enables the converter to operate with high efficiency across a broad spectrum of operating conditions while achieving significantly high step-down conversion ratios. This work presents a reconfigurable, fully integrated, two-phase interleaved switched-capacitor voltage regulator (SCVR) with an on-die MIM capacitor intended for low-power system-on-chips (SoCs). High power density and efficiency are made possible in on-chip switched-capacitor (SC) converter implementations using MIM capacitors with a low bottom-plate parasitic. The charge-multiplier model for reconfigurable SCVR is investigated and verified through modeling and simulation. With varying power supplies of 1.24 V, 1.15 V, and 1.03 V, a reconfigurable SCVR having four voltage conversion ratios (VCRs) has been designed to provide dynamic voltage scaling (DVS) of many-core microprocessors on a per-core basis. Further, the converter’s parasitic and charge-sharing losses are efficiently reduced by utilizing switch and frequency scaling techniques. The proposed SCVR is reconfigured into four gain topologies having VCRs 5:4, 4:3, 3:2, and 1:1 respectively. The nominal output voltage of the converter ranges from 0.6 V to 1 V, from three different power supplies. The proposed converter has a maximum load current of 625 mA and a peak efficiency of 81.09%. Further, it delivers load current ranging from 200 mA to 625 mA with an efficiency greater than 70%. To validate the design, it is developed and simulated using a 22 nm CMOS process. MATLAB and PSpice simulation tools are used to verify the results. |
| format | Article |
| id | doaj-art-e396067e236245c7b53ff687da430331 |
| institution | Kabale University |
| issn | 2169-3536 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj-art-e396067e236245c7b53ff687da4303312025-08-20T03:41:49ZengIEEEIEEE Access2169-35362025-01-011313725513727010.1109/ACCESS.2025.359399711104100Design and Analysis of On-Chip Reconfigurable SCVR With Wide Output Voltage Range for SoCsSunita Saini0https://orcid.org/0009-0002-9339-6181Davinder Singh Saini1https://orcid.org/0000-0003-3177-1193Vipin Balyan2https://orcid.org/0000-0002-5032-8966Department of Electronics and Communication Engineering, Chandigarh College of Engineering and Technology, Chandigarh, IndiaDepartment of Electronics and Communication Engineering, Chandigarh College of Engineering and Technology, Chandigarh, IndiaDepartment of Electrical, Electronics, and Computer Engineering, Cape Peninsula University of Technology, Bellville Campus, Cape Town, South AfricaA comprehensive framework for the analysis and design of reconfigurable two-phase switched-capacitor (SC) dc-dc converters is introduced. Initially, a generalized approach leveraging graph theory and network analysis is presented, enabling the enumeration of all possible ideal conversion ratios for a given SC converter topology. This methodology extends the performance boundaries of two-phase SC converters, leading to the proposal of a reconfigurable, two-phase SC dc-dc converter. The proposed converter incorporates a programmable, optimized switching configuration that enhances the number of achievable ideal conversion ratios for a fixed set of capacitors and switching states. This flexibility enables the converter to operate with high efficiency across a broad spectrum of operating conditions while achieving significantly high step-down conversion ratios. This work presents a reconfigurable, fully integrated, two-phase interleaved switched-capacitor voltage regulator (SCVR) with an on-die MIM capacitor intended for low-power system-on-chips (SoCs). High power density and efficiency are made possible in on-chip switched-capacitor (SC) converter implementations using MIM capacitors with a low bottom-plate parasitic. The charge-multiplier model for reconfigurable SCVR is investigated and verified through modeling and simulation. With varying power supplies of 1.24 V, 1.15 V, and 1.03 V, a reconfigurable SCVR having four voltage conversion ratios (VCRs) has been designed to provide dynamic voltage scaling (DVS) of many-core microprocessors on a per-core basis. Further, the converter’s parasitic and charge-sharing losses are efficiently reduced by utilizing switch and frequency scaling techniques. The proposed SCVR is reconfigured into four gain topologies having VCRs 5:4, 4:3, 3:2, and 1:1 respectively. The nominal output voltage of the converter ranges from 0.6 V to 1 V, from three different power supplies. The proposed converter has a maximum load current of 625 mA and a peak efficiency of 81.09%. Further, it delivers load current ranging from 200 mA to 625 mA with an efficiency greater than 70%. To validate the design, it is developed and simulated using a 22 nm CMOS process. MATLAB and PSpice simulation tools are used to verify the results.https://ieeexplore.ieee.org/document/11104100/Dc-dc converterpower managementreconfigurable SCVRseries-parallelswitched-capacitor |
| spellingShingle | Sunita Saini Davinder Singh Saini Vipin Balyan Design and Analysis of On-Chip Reconfigurable SCVR With Wide Output Voltage Range for SoCs IEEE Access Dc-dc converter power management reconfigurable SCVR series-parallel switched-capacitor |
| title | Design and Analysis of On-Chip Reconfigurable SCVR With Wide Output Voltage Range for SoCs |
| title_full | Design and Analysis of On-Chip Reconfigurable SCVR With Wide Output Voltage Range for SoCs |
| title_fullStr | Design and Analysis of On-Chip Reconfigurable SCVR With Wide Output Voltage Range for SoCs |
| title_full_unstemmed | Design and Analysis of On-Chip Reconfigurable SCVR With Wide Output Voltage Range for SoCs |
| title_short | Design and Analysis of On-Chip Reconfigurable SCVR With Wide Output Voltage Range for SoCs |
| title_sort | design and analysis of on chip reconfigurable scvr with wide output voltage range for socs |
| topic | Dc-dc converter power management reconfigurable SCVR series-parallel switched-capacitor |
| url | https://ieeexplore.ieee.org/document/11104100/ |
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