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Energy Recycling Voltage Scaler Based on Reconfigurable Capacitive Array
Syed Asmat Ali Shah,A.N. Ragheb,HyungWon Kim(김형원) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
This paper introduces a novel architecture of voltage scaler based on a reconfigurable capacitive array. While its reconfigurable structure allows it to scale the output voltage to any target level, its energy recycling process permits the voltage scaler to supply the voltage even after the input voltage is turned off. This architecture stores the energy in the capacitor array during the voltage scaling stage, then it reconfigures these charges step-wise to boost the lost voltage level during the energy recycling stage. Using the proposed architecture, an example voltage scaler was implemented using 65 nm CMOS process, which generates an output voltage of a range 500 mV to 1.16 V from an input voltage of 500 mV. Simulations were conducted with a 32-bit adder circuit as a load, which showed a reduction in energy consumption by 45.8% compared to a conventional converter.
Low-Power Voltage Converter Using Energy Recycling Capacitor Array
Shah, Syed Asmat Ali,Ragheb, A.N.,Kim, HyungWon The Korea Institute of Information and Commucation 2017 Journal of information and communication convergen Vol.15 No.1
This paper presents a low-power voltage converter based on a reconfigurable capacitor array. Its energy recycling capacitor array stores the energy during a charge stage and supplies the voltage during an energy recycle stage even after the power source is disconnected. The converter reconfigures the capacitor array step-wise to boost the lost voltage level during the energy recycle stage. Its energy saving is particularly effective when most of the energy remaining in the charge capacitors is wasted by the leakage current during a longer sleep period. Simulations have been conducted using a voltage source of 500 mV to supply a $V_{DD}$ of around 800 mV to a load circuit consisting of four 32-bit adders in a 65-nm CMOS process. Results demonstrate energy recycling efficiency of 85.86% and overall energy saving of 40.14% compared to a conventional converter, when the load circuit is shortly active followed by a long sleep period.
Marine Sponges as a Drug Treasure
( Komal Anjum ),( Syed Qamar Abbas ),( Sayed Asmat Ali Shah ),( Najeeb Akhter ),( Sundas Batool ),( Syed Shams Ul Hassan ) 한국응용약물학회 2016 Biomolecules & Therapeutics(구 응용약물학회지) Vol.24 No.4
Marine sponges have been considered as a drug treasure house with respect to great potential regarding their secondary metabolites. Most of the studies have been conducted on sponge’s derived compounds to examine its pharmacological properties. Such compounds proved to have antibacterial, antiviral, antifungal, antimalarial, antitumor, immunosuppressive, and cardiovascular activity. Although, the mode of action of many compounds by which they interfere with human pathogenesis have not been clear till now, in this review not only the capability of the medicinal substances have been examined in vitro and in vivo against serious pathogenic microbes but, the mode of actions of medicinal compounds were explained with diagrammatic illustrations. This knowledge is one of the basic components to be known especially for transforming medicinal molecules to medicines. Sponges produce a different kind of chemical substances with numerous carbon skeletons, which have been found to be the main component interfering with human pathogenesis at different sites. The fact that different diseases have the capability to fight at different sites inside the body can increase the chances to produce targeted medicines.
An Energy Efficient Charging Technique for Switched Capacitor Voltage Converters With Low-Duty Ratio
Arslan, Saad,Shah, Syed Asmat Ali,Lee, Jae-Jin,Kim, Hyungwon IEEE 2018 IEEE transactions on circuits and systems. a publi Vol.65 No.6
<P>Charging a capacitor array of a switched-capacitor (SC) dc-dc converter, supplying load circuits with a very short active period, can be pivotal to achieve high energy efficiency of its operation. This is because the capacitors may lose most of the stored energy during a long sleep period, and thus every sleep-to-active transition requires full recharging of the capacitors. In this brief, we present an energy efficient capacitor charging technique called split-capacitor charging, which charges a capacitor array in a step-wise fashion. Circuit simulations demonstrate that the proposed technique can reduce the energy wastage during sleep-to-active transition up to 66%. When tested on load circuits with a short active period, a voltage converter employing the proposed charging method shows up to 24% improvement in energy efficiency over conventional SC converters.</P>
A Reconfigurable Controller for Testing On-Chip Voltage Converters
Saad Arslan,Syed Asmat Ali Shah,HyungWon Kim 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
When testing on-chip voltage converters driving on chip loads, the use of external loads and control signal generation is not a feasible. External loads add unwanted parasitics while externally generated signals experience varying delays. To overcome these problems, on-chip reconfigurable control signal generation and load is needed. In this paper, a flexible on-chip controller is presented to test integrated voltage converters. The controller when accompanied by reconfigurable load circuit offers a comprehensive solution. Additionally, the controller is programmable through SPI for easy switching between test scenarios. Synopsys design platform is used for synthesis, Place and Route (PNR), and simulations. PNR simulations verify the controller"s SPI interface and control signal generation at 50 Hz clock frequency.
A Low Power Mixed Signal Convolutional Neural Network for Deep Learning SoC
말릭 수메르,Syed Asmat Ali Shah,김형원 한국과학기술원 반도체설계교육센터 2023 IDEC Journal of Integrated Circuits and Systems Vol.9 No.3
Convolutional Neural Networks (CNNs) are getting fame due to their simpler design and higher performance. However, CNNs suffer from a large area and power consumption constraints. The multiply-and-accumulate (MAC) unit, which performs the convolution operation inside a CNN, consumes a significant amount of power consumption. In this study, we propose a mixed-signal approach for implementing analog MAC unit that can replace the digital MAC unit in CNNs. The Analog MAC unit architecture is constituted from binary weighted current steering digital-to-analog (DAC) circuit and capacitors. A digital parallel interface is designed to provide input image and filter values to the MAC unit. To realize a complete CNN model a low-power analog-to-digital (ADC) is then employed at the output to convert the final value back to a digital value. When a 3×3 convolution is performed, the analog MAC unit offers a 10.7% reduction in area and a 59.2% reduction in power consumption compared to its fully digital counterparts.
Marine Sponges as a Drug Treasure
Anjum, Komal,Abbas, Syed Qamar,Shah, Sayed Asmat Ali,Akhter, Najeeb,Batool, Sundas,Hassan, Syed Shams ul The Korean Society of Applied Pharmacology 2016 Biomolecules & Therapeutics(구 응용약물학회지) Vol.24 No.4
Marine sponges have been considered as a drug treasure house with respect to great potential regarding their secondary metabolites. Most of the studies have been conducted on sponge's derived compounds to examine its pharmacological properties. Such compounds proved to have antibacterial, antiviral, antifungal, antimalarial, antitumor, immunosuppressive, and cardiovascular activity. Although, the mode of action of many compounds by which they interfere with human pathogenesis have not been clear till now, in this review not only the capability of the medicinal substances have been examined in vitro and in vivo against serious pathogenic microbes but, the mode of actions of medicinal compounds were explained with diagrammatic illustrations. This knowledge is one of the basic components to be known especially for transforming medicinal molecules to medicines. Sponges produce a different kind of chemical substances with numerous carbon skeletons, which have been found to be the main component interfering with human pathogenesis at different sites. The fact that different diseases have the capability to fight at different sites inside the body can increase the chances to produce targeted medicines.