{"title":"Gate Voltage Optimization in Capacitive DC-DC Converters for Thermoelectric Energy Harvesting","authors":"Y. Tan, Y. Shiiki, H. Ishikuro","doi":"10.1145/3394885.3431654","DOIUrl":"https://doi.org/10.1145/3394885.3431654","url":null,"abstract":"This paper presents a gate voltage optimized fully integrated charge pump for thermoelectric energy harvesting applications. In this paper, the trade-off generated by rising the gate voltage of switching transistors are discussed. The proposed 5/3-stage design, which implemented with 180 nm CMOS technique, achieved a down to 0.12V/0.13V startup voltage correspondingly with the proposed technique. A 20% peak power conversion efficiency improvement is achieved when comparing with a similar 3-stage linear charge pump in previous state-of-the-art research.","PeriodicalId":186307,"journal":{"name":"2021 26th Asia and South Pacific Design Automation Conference (ASP-DAC)","volume":"16 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134594326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"TCI Tester: Tester for Through Chip Interface","authors":"Hideto Kayashima, H. Amano","doi":"10.1145/3394885.3431660","DOIUrl":"https://doi.org/10.1145/3394885.3431660","url":null,"abstract":"TCI [1] is an inductive coupling wireless chip-to-chip interface. For forming a link with TCI, the transmitter coils are placed just above receivers’ ones, and data are transferred between them through the magnetic field. Each TCI channel needs two inductors, one for a high-speed clock signal (1-8GHz) and the other for the data directly transfer digital data synchronized with the clock signal without any modulation. TCI has the following advantages. First, the inductor consists of common wires in the CMOS process technology without the particular process technology, unlike the TSV. Also, ESD (Electro Static Discharge) protection device is unnecessary, since TCI is electrically contact-less.","PeriodicalId":186307,"journal":{"name":"2021 26th Asia and South Pacific Design Automation Conference (ASP-DAC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133458574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Joseph, Lennart Bamberg, Geonhwa Jeong, Ruei-Ting Chien, R. Leupers, A. García-Ortiz, T. Krishna, Thilo Pionteck
{"title":"Bridging the Frequency Gap in Heterogeneous 3D SoCs through Technology-Specific NoC Router Architectures","authors":"J. Joseph, Lennart Bamberg, Geonhwa Jeong, Ruei-Ting Chien, R. Leupers, A. García-Ortiz, T. Krishna, Thilo Pionteck","doi":"10.1145/3394885.3431421","DOIUrl":"https://doi.org/10.1145/3394885.3431421","url":null,"abstract":"In heterogeneous 3D System-on-Chips (SoCs), NoCs with uniform properties suffer one major limitation; the clock frequency of routers varies due to different manufacturing technologies. For example, digital nodes allow for a higher clock frequency of routers than mixed-signal nodes. This large frequency gap is commonly tackled by complex and expensive pseudo-mesochronous or asynchronous router architectures. Here, a more efficient approach is chosen to bridge the frequency gap. We propose to use a heterogeneous network architecture. We show that reducing the number of VCs allows to bridge a frequency gap of up to 2×. We achieve a system-level latency improvement of up to 47% for uniform random traffic and up to 59% for PARSEC benchmarks, a maximum throughput increase of 50%, up to 68% reduced area and 38% reduced power in an exemplary setting combining 15-nm digital and 30-nm mixed-signal nodes and comparing against a homogeneous synchronous network architecture. Versus asynchronous and pseudo-mesochronous router architectures, the proposed optimization consistently performs better in area, in power and the average flit latency improvement can be larger than 51%.","PeriodicalId":186307,"journal":{"name":"2021 26th Asia and South Pacific Design Automation Conference (ASP-DAC)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132397654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yun-Chen Lo, Bing Li, Sooyong Park, K. Shin, Tsung-Yi Ho
{"title":"Interference-Free Design Methodology for Paper-Based Digital Microfluidic Biochips","authors":"Yun-Chen Lo, Bing Li, Sooyong Park, K. Shin, Tsung-Yi Ho","doi":"10.1145/3394885.3431609","DOIUrl":"https://doi.org/10.1145/3394885.3431609","url":null,"abstract":"Paper-based digital microfluidic biochips (P-DMFBs) have recently attracted great attention for its low-cost, in-place, and fast fabrication. This technology is essential for agile bio-assay development and deployment. P-DMFBs print electrodes and associate control lines on paper to control droplets and complete bio-assays. However, P-DMFBs have following issues: 1) control line interference may cause unwanted droplet movements, 2) avoiding control interference degrades assay performance and routability, 3) single layer fabrication limits routability, and 4) expensive ink cost limits low-cost benefits of P-DMFBs. To solve above issues, this work proposes an interference-free design methodology to design P-DMFBs with fast assay speed, better routability, and compact printing area. The contributions are as follows: First, we categorize control interference into soft and hard. Second, we identify only soft interference happens and propose to remove soft control interference constraints. Third, we propose an interference-free design methodology. Finally, we propose a cost-efficient ILP-based fluidic design module. Experimental results show proposed method outperforms prior work [14] across all bio-assay benchmarks. Compared to previous work, our cost-optimized designs use only 47%~78% area, gain 3.6%~16.2% more routing resources, and achieve 0.97x~1.5x shorter assay completion time. Our performance-optimized designs can accelerate assay speed by 1.05x~1.65x using 81%~96% printed area.","PeriodicalId":186307,"journal":{"name":"2021 26th Asia and South Pacific Design Automation Conference (ASP-DAC)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115698816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Robustness of Neuromorphic Computing with RRAM-based Crossbars and Optical Neural Networks","authors":"Grace Li Zhang, Bing Li, Ying Zhu, Tianchen Wang, Yiyu Shi, Xunzhao Yin, Cheng Zhuo, Huaxi Gu, Tsung-Yi Ho, Ulf Schlichtmann, Xunzhao, Yin","doi":"10.1145/3394885.3431634","DOIUrl":"https://doi.org/10.1145/3394885.3431634","url":null,"abstract":"RRAM-based crossbars and optical neural networks are attractive platforms to accelerate neuromorphic computing. However, both accelerators suffer from hardware uncertainties such as process variations. These uncertainty issues left unaddressed, the inference accuracy of these computing platforms can degrade significantly. In this paper, a statistical training method where weights under process variations and noise are modeled as statistical random variables is presented. To incorporate these statistical weights into training, the computations in neural networks are modified accordingly. For optical neural networks, we modify the cost function during software training to reduce the effects of process variations and thermal imbalance. In addition, the residual effects of process variations are extracted and calibrated in hardware test, and thermal variations on devices are also compensated in advance. Simulation results demonstrate that the inference accuracy can be improved significantly under hardware uncertainties for both platforms.","PeriodicalId":186307,"journal":{"name":"2021 26th Asia and South Pacific Design Automation Conference (ASP-DAC)","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115971227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Herdt, Sören Tempel, Daniel Große, R. Drechsler
{"title":"Mutation-based Compliance Testing for RISC-V","authors":"V. Herdt, Sören Tempel, Daniel Große, R. Drechsler","doi":"10.1145/3394885.3431584","DOIUrl":"https://doi.org/10.1145/3394885.3431584","url":null,"abstract":"Compliance testing for RISC-V is very important. Essentially, it ensures that compatibility is maintained between RISC-V implementations and the ever growing RISC-V ecosystem. Therefore, an official Compliance Test-suite (CT) is being actively developed. However, it is very difficult to achieve that all relevant functional behavior is comprehensively tested.In this paper, we propose a mutation-based approach to boost RISC-V compliance testing by providing more comprehensive testing results. Therefore, we define mutation classes tailored for RISC-V to assess the quality of the CT and provide a symbolic execution framework to generate new test-cases that kill the undetected mutants. Our experimental results demonstrate the effectiveness of our approach. We identified several serious gaps in the CT and generated new tests to close these gaps.","PeriodicalId":186307,"journal":{"name":"2021 26th Asia and South Pacific Design Automation Conference (ASP-DAC)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122036347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Deep Learning for Mask Synthesis and Verification: A Survey","authors":"Yibo Lin","doi":"10.1145/3394885.3431624","DOIUrl":"https://doi.org/10.1145/3394885.3431624","url":null,"abstract":"Achieving lithography compliance is increasingly difficult in advanced technology nodes. Due to complicated lithography modeling and long simulation cycles, verifying and optimizing photomasks becomes extremely expensive. To speedup design closure, deep learning techniques have been introduced to enable data-assisted optimization and verification. Such approaches have demonstrated promising results with high solution quality and efficiency. Recent research efforts show that learning-based techniques can accomplish more and more tasks, from classification, simulation, to optimization, etc. In this paper, we will survey the successful attempts of advancing mask synthesis and verification with deep learning and highlight the domain-specific learning techniques. We hope this survey can shed light on the future development of learning-based design automation methodologies.","PeriodicalId":186307,"journal":{"name":"2021 26th Asia and South Pacific Design Automation Conference (ASP-DAC)","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124502932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Fink, Philipp Ebner, M. Hamidović, W. Haselmayr, R. Wille
{"title":"Accurate and Efficient Simulation of Microfluidic Networks","authors":"G. Fink, Philipp Ebner, M. Hamidović, W. Haselmayr, R. Wille","doi":"10.1145/3394885.3431608","DOIUrl":"https://doi.org/10.1145/3394885.3431608","url":null,"abstract":"Microfluidics is a prospective field which provides technological advances to the life sciences. However, the design process for microfluidic devices is still in its infancy and frequently results in a \"trial-and-error\" scheme. In order to overcome this problem, simulation methods provide a powerful solution—allowing for deriving a design, validating its functionality, or exploring alternatives without the need of an actual fabricated and costly prototype. To this end, several physical models are available such as Computational Fluid Dynamics (CFD) or the 1-dimensional analysis model. However, while CFD-simulations have high accuracy, they also have high costs with respect to setup and simulation time. On the other hand, the 1D-analysis model is very efficient but lacks in accuracy when it comes to certain phenomena. In this work, we present ideas to combine these two models and, thus, to provide an accurate and efficient simulation approach for microfluidic networks. A case study confirms the general suitability of the proposed approach.","PeriodicalId":186307,"journal":{"name":"2021 26th Asia and South Pacific Design Automation Conference (ASP-DAC)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127397518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Eleonora Testa, Siang-Yun Lee, Heinz Riener, G. Micheli
{"title":"Algebraic and Boolean Optimization Methods for AQFP Superconducting Circuits","authors":"Eleonora Testa, Siang-Yun Lee, Heinz Riener, G. Micheli","doi":"10.1145/3394885.3431606","DOIUrl":"https://doi.org/10.1145/3394885.3431606","url":null,"abstract":"Adiabatic quantum-flux-parametron (AQFP) circuits are a family of superconducting electronic (SCE) circuits that have recently gained growing interest due to their low-energy consumption, and may serve as alternative technology to overcome the down-scaling limitations of CMOS. AQFP logic design differs from classic digital design because logic cells are natively abstracted by the majority function, require data and clocking in specific timing windows, and have fan-out limitations. We describe here a novel majority-based logic synthesis flow addressing AQFP technology. In particular, we present both algebraic and Boolean methods over majority-inverter graphs (MIGs) aiming at optimizing size and depth of logic circuits. The technology limitations and constraints of the AQFP technology (e.g., path balancing and maximum fanout) are considered during optimization. The experimental results show that our flow reduces both size and depth of MIGs, while meeting the constraint of the AQFP technology. Further, we show an improvement for both area and delay when the MIGs are mapped into the AQFP technology.","PeriodicalId":186307,"journal":{"name":"2021 26th Asia and South Pacific Design Automation Conference (ASP-DAC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125669988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An 18 Bit Time-to-Digital Converter Design with Large Dynamic Range and Automated Multi-Cycle Concept","authors":"Peter Toth, H. Ishikuro","doi":"10.1145/3394885.3431643","DOIUrl":"https://doi.org/10.1145/3394885.3431643","url":null,"abstract":"This paper presents a wide-dynamic-range high-resolution time-domain converter concept tailored for low-power sensor interfaces. The unique system structure applies different techniques to reduce circuit complexity, power consumption, and noise sensitivity. A multi-cycle concept allows a virtual delay line extension and is applied to achieve high resolution down to 1 ns. At the same time, it expands the dynamic range drastically up to 2.35 ms. Moreover, individually tunable delay elements in the range of 1 ns to 12 ns allow on-demand flexible operation in a low- or high-resolution mode for smart sensing applications and flexible power control. The concept of this paper is evaluated by a custom-designed FPGA supported PCB. The presented concept is highly suitable for on-chip integration.University LSI Design Contest ASP-DAC 2021","PeriodicalId":186307,"journal":{"name":"2021 26th Asia and South Pacific Design Automation Conference (ASP-DAC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130220113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}