category » Circuits & Systems

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Graphene-based CMOS Infrared Imaging System
  • The CMOS image sensor is widely used in digital multimedia applications. Its performance ramps up every year with denser integration,…


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Graphene Chemical Sensors on Flexible Substrates
  • With its all-surface 2D structure combined with very high carrier mobility, graphene is an extremely promising candidate for high sensitivity…


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Flush-mounted MEMS Langmuir Probe Arrays for HF-S Band Plasma-sensing
  • Arrays of MEMS Langmuir probes that are flush-mountable (Figure 1) can serve as a sensorial skin on a spacecraft for…


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A Wearable, Long-term Cardiac Monitor
  • With the escalating costs of hospital visits, clinicians are opting to use at-home monitoring devices to diagnose patients.  Current ECG…


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A Wearable EEG Monitor for Seizure Detection
  • Epilepsy is a common chronic neurological disorder that affects about 1% of the world population [1] . It is characterized…


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An Electronically Steered, Wearable Transcranial Doppler Ultrasound System
  • Traumatic brain injury (TBI) occurs in over 1.4 million persons annually in the United States [1] .  Monitoring of a…


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Building Compressed Sensing Systems: Sensors and Analog Information Converters
  • Compressed sensing (CS) is a promising method for recovering sparse signals from fewer measurements than ordinarily used in Shannon’s sampling…


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Designing Complex Digital Systems with Nano-electro-mechanical Relays
  • Silicon CMOS circuits have a well-defined lower limit on their achievable energy efficiency due to sub-threshold leakage. Once this limit…


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A Monolithic Electronic-photonic Integration Platform in Commercial 45-nm SOI
  • Integrated photonic interconnects present a disruptive alternative to electrical I/O for many VLSI applications, with potential for superior bandwidth density…


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High-throughput Digital Baseband for mm-Wave Outphasing Power Amplifiers
  • Outphasing power amplifier architectures such as linear amplification with nonlinear components (LINC) have been used to improve the power efficiency…


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Hardware Implementations of Customized Optimization Engines: Model Predictive Control Example
  • Numerical algorithms are the basis of many important technologies employed in industry and academia. Their efficient implementation is key in…


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Very-high-speed Serial Links
  • Demand for bandwidth in chip-to-chip communication has been increasing as the industry demands a higher quantity and quality of information….


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DSENT–A Tool for Modeling Opto-electronic Networks-on-Chip
  • With the rise of many-core chips that require substantial bandwidth from the network-on-chip (NoC), integrated photonic links have been investigated…


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2D Crystals for Ubiquitous Electronics
  • Two-dimensional crystals, including graphene, hexagonal boron nitride, and transition metal dichalcogenides (TMD) materials, have outstanding properties for developing the next…


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Approaching the Theoretical Limits of a Mesh NoC with a 16-node Chip Prototype in 45nm SOI CMOS
  • Moore’s law scaling and the diminishing performance returns of complex uniprocessor chips have led to the advent of multicore processors…


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Lossless Multi-Way Power Combining and Outphasing for Radio-Frequency Power Amplifiers
  • For applications requiring the use of power amplifiers (PAs) operating at high frequencies and power levels, it is often preferable…


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Wireless Body Area Networks Using Body-coupled Communication
  • To achieve comfortable form factors for wireless medical devices, battery size, and thus power consumption, must be curtailed.  Often the…


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Analog Front-end Design for Portable Ultrasound Systems
  • The Capacitive Micromachined Ultrasound Transducer (CMUT) is an alternative to traditional piezoelectric transducers. The CMUT technology provides an opportunity for…


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Universal Villages
  • Due to growing populations in cities, resources for city and village residents have become scarce while costs for public services…


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Front-end Design for Portable Ultrasound Systems
  • Most current ultrasound imaging systems use piezoelectric materials for the ultrasound transducer. The recent development of micro-electromechanical systems (MEMS) allowed…


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A Two-step Pipelined Triple-slope ADC
  • High resolution and high speed in data converters are difficult to achieve at low power consumption levels [1] .  …


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Continuous-time Bandpass Delta-sigma Modulator
  • Bandpass delta-sigma modulators (BPDSMs) are particularly useful in modern receiver systems. In a BPDSM system, high-frequency narrow band signals are…


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Continuous-time Delta-sigma Analog-to-digital Converters for Application to Multiple-input Multiple-output Systems
  • As wireless communication technology is rapidly advancing, new wireless applications are continuously developed. Figure 1 shows each application space and…


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Harvesting Energy from Non-ideal Vibrations
  • This project focuses on two vibration non-idealities that affect the performance of vibration energy harvesters [1] [2] . Most vibration…


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Time-interleaved A/D Converters
  • There is an ever-increasing demand for high-resolution and high-accuracy A/D converters in communication systems. In order to raise the sampling…


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Adaptive Low-power Sensor Interfaces for Wireless Sensor Nodes
  • Wireless sensor nodes (WSNs) have a great potential to save energy and improve safety when applied to building energy monitoring,…


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An Ultra-low-voltage Mixed-signal Front-end for a Wearable ECG Monitor
  • Circuits for wearable vital sign monitors have very stringent requirements on power dissipation due to limited energy storage capacity and…


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FastMarkov: A Markov–Chain-based Hierarchical Solver for Large-scale Capacitance Extraction
  • Standard full-chip capacitance extraction algorithms rely for computational efficiency on 2D scanning and table lookup algorithms. These algorithms trade off…


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Compact Modeling of “Nonlinear” Analog Circuits using System Identification with Incremental Stability Certification
  • During recent years, researchers in the Electronic Design Automation community have made great efforts to develop new techniques to automatically…


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CAPLET: A Parallelized Boundary Element Method for VLSI Capacitance Extraction with Instantiable Basis Functions
  • Traditional interconnect capacitance extraction tools usually employ 2D scanning and table look-up methods for fast extraction.  For some structures, e.g.,…


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An Efficient Framework for Passive Compact Dynamical Modeling of Multiport Linear Systems
  • Automatic generation of accurate, compact, and passive dynamical models for multiport linear structures such as interconnects is a crucial part…


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Non-volatile Processing for Battery-less Operation
  • The emergence of faster and lower-power non-volatile memory technologies has opened up the investigation of ways to integrate these technologies…


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Energy-aware Computational Imaging
  • With computational imaging becoming an integral part of photography, enabling this functionality on portable multimedia device is important. Portable device…


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Coding Efficiency vs. Memory Cost Trade-offs for High-efficiency Video Coding (HEVC) Motion Estimation
  • High-efficiency Video Coding (HEVC) is a new video compression standard currently being standardized by the Joint Collaborative Team on Video…


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Low-voltage SRAM Caches with On-fly Energy Monitoring for Exascale Processors
  • On-chip memories are responsible for a large portion (40% by many estimates [1] ) of the total energy consumption and…


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Graphene Nanoribbons for Flexible Digital Circuits
  • Today, power dissipation is one of the most important limiting factors in digital circuit design. As devices scale further and…


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An Ultra-low-power ISM-band Transmitter with Tunable Channel-Network Coding
  • Designing a low-power wireless communication system involves two major milestones: use of very efficient RF architectures, including circuits for power…


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LED Lighting System using Gallium Nitride FETs
  • This work focuses on using gallium nitride (GaN) FETs for an LED lighting system. The idea is to utilize the…


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A Low-power, Reconfigurable Body Area Network for Healthcare Monitoring
  • Advancements in low-power electronics have opened up many opportunities to provide healthcare solutions through continuous, unobtrusive sensing of vital physiological…


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An 8-channel Scalable EEG Acquisition SoC with Fully Integrated Patient-specific Seizure Classification and Recording Processor
  • Continuous tracking of neurological disorders is crucial for the proper diagnosis and medication of epilepsy, and it mandates the design…


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A Quad Full HD High Efficiency Video Coding Decoder Chip
  • The ever-increasing demand for richer internet video content and larger video resolution has motivated work on algorithms that achieve higher…


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A Scalable Beamforming Architecture for Portable/Wearable Ultrasound Imaging
  • An ultrasound image is formed from a collection of ultrasonic beams transmitted and received by an array of transducer elements. …


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A Mini-platform for Wireless Sensors
  • Sensing, data processing, and communication are essential functions of a useful sensor node, whether used in industrial, health or sports…


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Energy-scalable Speech-recognition Circuits
  • Speech recognition is becoming a ubiquitous component of the digital infrastructure, serving as an I/O adapter between people and electronic…


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Recombination Dynamics of Charge Carriers in Nanostructured Solar Cells
  • Nanostructured solar cells are attracting increasing attention as a promising photovoltaic (PV) technology [1] . Generation of free charge carriers…


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Validation of an Ultra-compact Virtual Source FET Model for Deeply Scaled Standard Cell Libraries and Digital Circuits
  • In this work, the virtual source (VS) charge-based compact model is validated for standard cell libraries and digital circuits. The…


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An On-Chip Test Circuit for Characterization of MEMS Resonator
  • Electromechanical resonators such as quartz crystals, surface acoustic wave (SAW) resonators, and ceramic resonators have become essential components in electronic…


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A Low-power SAR ADC with Redundancy
  • Technology scaling has enabled low-power operations in digital integrated circuits.  Therefore, the trend to move analog-to-digital operations upstream to allow…