harvard VLSI lab

Time 2020-09-20 09:03:56

Web Name: harvard VLSI lab

WebSite: http://vlsi.eecs.harvard.edu

ID:53180

Keywords:

harvard,VLSI,lab,

Description:

TheTop K System is an intriguing form of memory based computation.The basic computing component is an IRAM (Intelligent RAM) and is a singlechip with a high density 16Mbit DRAM and 800K transistor parallel processorarray for computing/sorting/routing. By integrating these IRAM chips, itis possible to implement a fully scalable system for rapidly searchinglarge multidimensional databases at speeds that are orders of magnitudefaster than possible with any existing hardware.MachineVision Coprocessors augment the general-purpose computing capabilitesof commercial microprocessors like the Pentium by providing highly optimizedcomputing components for many common image processing tasks in machinevision. As a demonstration, we implemented a real-time face recognitionsystem using only a 80486/66 and a VLSI image correlator.UltraLow Bandwidth Video Coder/Decoder uses a vector quantization codingapproach that has been optimized for both video applications and VLSI implementation.(see:Full picture of VQ coder)UltraLow Power / Low Voltage DRAM is targeting the market of Portablecomputer, PDA, cellular phone and so on. Fundamental limitations of Lowpower and Low voltage for DRAM are being investigated and the solutionswill be proposed from the designer's perspective.AnalogCCD/CMOS Circuitry combines the analog charge manipulation capabilitesof CCDs (charge-coupled devices) and CMOS switched-capacitor circuitryto implement low power, low voltage, compact analog signal processing systems.In particular, we have implemented various smart vision sensors with integratedimage sensors and analog signal processing circuitry as well as mixed-signalprogrammable filters.CMOSImage Sensors have been implemented using a customized submicronCMOS process. Image sensor elements with high quantum efficiency throughthe entire visible spectrum, high sensitivity, and good digital noise immunityhave been demonstrated. This technology has been used to demonstrate imagingarrays with 512x512 pixel resolution and with integrated ADC and digitalinterface circuitry.Would you like to see new picture of CMOS image sensors? click on me!!Analysisand Design of Sigma-Delta Systems Sigma-Delta modulators are nonlinearfeedback systems that are used in many analog-to-digital and digital-to-analogconverters. However, standard analysis techniques which are based on linearizingapproximations have only provided limited insight into the optimal designand operation of these systems. By developing a closed-form nonlinear analysis,we have been able to answer many open problems and provide solutions forsignificantly improving the performance of these systems as data converters.We have specifically focused our attention on issues that will have a profoundimpact on the design and implementation of practical sigma-delta systems.NeuromorphicPulse Computing The vast majority of microelectronic informationprocessing systems are implemented using either analog or digital circuitry.Traditional analog circuitry encodes information as a continuous amountof charge, voltage or current. Similarly, digital circuitry encodes informationas quantitized levels of charge, voltage or current. In constrast, we areexploring circuitry and information processing systems that will encodeand process information in the time/frequency domain or more generallyas a pattern or sequence of asynchronous pulses. While this mode of processinginformation has been essentially ignored by electrical engineers and computerscientists, it appears to be the dominant mode of information processingin biological neural systems. Although the practical implications of pulsecomputing have yet to be determined, our long term goal is to develop amodel of pulse computation and to demonstrate VLSI systems based on thismode of computation and communication.CBCLat MITHarvard Robotics LabWe gratefully acknowledge generous support for our research fromthe National Science Foundation, the Office of Naval Research, the JointServices Electronics Program, DARPA, Hamamatsu Photonics, Microsoft, andHyundai Electronics.WoodwardYang

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