An Efficient Switched-Capacitor DC-DC Buck Converter for Self-Powered Wearable Electronics

Kilani, Dima; Alhawari, Mohammad; Mohammad, Baker; Saleh, Hani; Ismail, Mohammed

doi:10.1109/tcsi.2016.2586117

Cited by 63 publications

(16 citation statements)

References 29 publications

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“…Voltage converters are essential building blocks for many low power devices, such as biomedical devices, mobile phones, wireless sensor networks, energy harvesting devices, and internet-of-things (IoT) devices [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Reference-Free Dynamic Voltage Scaler Based on Swapping Switched-Capacitors

Ragheb

Kim

2019

Energies

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This paper introduces a reference-free, scalable, and energy-efficient dynamic voltage scaler (DVS) that can be reconfigured for multiple outputs. The proposed DVS employs a novel swapping switched-capacitor (SSC) technique, which can generate target output voltages with higher resolution and smaller ripple voltages than the conventional voltage scalers based on switched-capacitors. The proposed DVS consists of a cascaded 2:1 converter based on swapping capacitors, which is essential to achieve both very small voltage ripple and fine-grain conversion ratios. One of the serious drawbacks of the conventional voltage scalers is the need for external reference voltages to maintain the target output voltage. The proposed SSC; however, eliminates the needs for any reference voltages. This significant benefit is achieved by the self-charging ability of the SSC, which can recharge all its capacitors to the configured voltage by simply swapping the two capacitors in each stage. The proposed SSC-DVS was designed with a resolution of 16 output levels and implemented using a 130 nm CMOS (Complementary Metal Oxide semiconductor) process. We conducted measured results and post-layout simulations with an input voltage of 1.5 V to produce an output voltage range of 0.085–1.4 V, which demonstrated a power efficiency of 85% for a load current of 550 µA with a voltage ripple of as low as 2.656 mV for a 2 KΩ resistor load.

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Section: Introductionmentioning

confidence: 99%

“…in B code = (010110)2 . Hence, V out2 = V in +V out1 125 V. In this way, the steady-state output voltage of each stage could be determined by selecting a configuration code.Energies 2019, 12, 625 7 of A small example of 2-bit SSC-DVS architecture with conversion ratios of and : (a) Phase 1 (φ1); and (b) phase 2 (φ2).…”

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confidence: 99%

Reference-Free Dynamic Voltage Scaler Based on Swapping Switched-Capacitors

Ragheb

Kim

2019

Energies

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“…4 is simulated in Cadence software using global foundry 65 nm CMOS low-power enhanced technology [44]. The comparator circuit used is a voltage latch sense amplifier type circuit similar to the one in [45], which has been verified in silicon [46]. The priority encoder is designed using multiple 'OR' and 'AND' gates based on the Boolean expression described in the equations below, using 65 nm CMOS technology as well…”

Section: Conventional Flash Adc and Resistor Mismatch Effectmentioning

confidence: 99%

On‐chip tunable Memristor‐based flash‐ADC converter for artificial intelligence applications

Humood

Mohammad

Abunahla

et al. 2020

IET Circuits, Devices & Systems

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This study presents a novel hybrid memristor (MR)-complementary metal-oxide-semiconductor-based flash analogue-to-digital converter (ADC). The speed and efficiency of the ADC are important aspects that can significantly affect the overall system performance. The flash ADC is considered the fastest type of ADCs; however, its performance is affected by the resistor mismatch. The proposed flash ADC is the first to use tunable MR to replace conventional resistor to generate accurate reference voltages. This is achieved by utilising the highly analogue behaviour observed in multi-state MR devices fabricated and tested by the authors' group. The electrical parameters of the devices have been extracted by device characterisation, then the voltage-threshold adaptive model (VTEAM) has been used to develop a correlated mathematical and Simulation Program with Integrated Circuit Emphasis (SPICE) device model. The proposed MR-based flash-ADC design solves the issue of resistor mismatch that results in encoding errors by the ability to tune the MR resistance value post-processing. Moreover, being a nanoscale component, the usage of MR significantly improves the area efficiency of the target ADC. Furthermore, the proposed design has improved the ADC transfer function characteristic and has lower differential non-linearity and integral non-linearity errors compared with the conventional design.

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“…Switched-capacitor (SC) DC-DC converters are gaining attention for the advantage of monolithic integration of the converter and no off-chip inductors for low-power applications [3]. Pulse frequency modulation (PFM) is a popular control technique used in SC converters to maintain high efficiency over a wide load current range [4].…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Switched-Capacitor DC-DC Converter with Three Decades of Load Current Range Using Adaptively-Biased PFM

Veerabathini

Furth

2020

JLPEA

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A fully-integrated switched-capacitor (SC) DC-DC converter that steps down 2.0 V to 0.9 V with a peak efficiency of 80% is implemented in a 0.18 μ m CMOS process. An ultra-low-power voltage-controlled oscillator that generates a wide range of switching frequencies is proposed to extend battery runtime. An efficiency >70% for load currents in the range of 12 μ A to 17.8 mA is achieved by implementing a novel adaptively-biased pulse frequency modulation (ABPFM) technique in the controller. A symmetric charge-discharge topology with two-phase time interleaving is used as a power stage to reduce the output voltage ripple to <72 mV over the entire load current range.

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An Efficient Switched-Capacitor DC-DC Buck Converter for Self-Powered Wearable Electronics

Cited by 63 publications

References 29 publications

Reference-Free Dynamic Voltage Scaler Based on Swapping Switched-Capacitors

Reference-Free Dynamic Voltage Scaler Based on Swapping Switched-Capacitors

On‐chip tunable Memristor‐based flash‐ADC converter for artificial intelligence applications

High-Efficiency Switched-Capacitor DC-DC Converter with Three Decades of Load Current Range Using Adaptively-Biased PFM

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