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Circuits and Devices Magazine, IEEE

Issue 6 • Date Nov. 2003

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Displaying Results 1 - 14 of 14
  • Link budget analysis for multistandard receiver architectures

    Publication Year: 2003 , Page(s): 5 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (645 KB)  

    As devices shrink, creating integrated circuits (ICs) that work with the required accuracy becomes more difficult due to issues related to device physics. Receivers are part of an area referred to as "mixed-signal design," meaning that both analog and digital circuitry will be on the same IC. This too presents many challenging issues, as the analog circuitry is highly sensitive to disruptions caused by the noisy digital circuitry. Therefore, accurate modeling and simulation is crucial in the design of wireless receivers to ensure the best possible operation of the fabricated IC. Through simulation and modeling a designer can determine if receiver architecture will meet the required specifications and pinpoint the possible problems before valuable time is spent developing the actual circuit. This article will present design issues for multistandard wireless receivers to give the reader an understanding of the challenges involved in link-budget analysis. TITAN (Toolbox for Integrated Transceiver Analysis), a link-budget analysis tool developed at The Ohio State University Analog VLSI Laboratory, will be presented as an example of a tool for receiver simulation. To determine design performance, various requirements must be translated to model parameters. Among the requirements for receivers are noise floor (NF), second- and third-order distortion (IP2 and IP3, respectively), reciprocal mixing, and phase noise. TITAN offers a graphical interface and encapsulated models to the designer, eliminating the possibility of formula corruption. The interface provides a more intuitive and sophisticated way of setting up the simulation and provides the designer with more readable results. Additionally, a blocking profile component allows the architecture to be tested across multiple standards. View full abstract»

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  • Swept away [quantum-well infrared photodetectors]

    Publication Year: 2003 , Page(s): 9 - 16
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (731 KB) |  | HTML iconHTML  

    The ultra high-speed capability of quantum-well infrared photodetectors (QWIPs) is well known, thanks to their intrinsic short carrier lifetime (∼5 ps). This obviously makes QWIPs well suited for high-speed and high-frequency applications. In the past, for thermal infrared imaging where devices are optimized to have the highest possible detectivity, the absorption quantum efficiency has been low (<10%). For high-speed applications where lasers are usually used, the most important parameter is the absorption efficiency. We show that high absorption (∼100%) can be easily achieved by simply changing some of the device parameters. We also review the experimental demonstrations of the high-speed capability. At present, QWIPs hold the unique position of having high-speed/-frequency capability and high absorption for the thermal infrared region. There are no competitive alternatives. View full abstract»

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  • Semiconductor quantum dots

    Publication Year: 2003 , Page(s): 24 - 29
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB) |  | HTML iconHTML  

    Since the invention of semiconductor lasers, huge improvements in device performance have been achieved, and a large variety of specialized designs for different applications were conceived. Two major steps have played a key role in the improvement of device properties. The first step was the application of semiconductor heterostructures that allowed the separate optimization of optical and carrier confinement. The second step was the introduction of quantum films, also called quantum wells, in the carrier recombination zone (started in the 1980s). This permitted a strong reduction of threshold current density due to an increased density of states at the laser energy. This effect of increased density of states is related to the partial discretization of the allowed energy states of carriers, i.e., electrons and holes, and is based on quantum mechanical principles. One major advantage of quantum-dot structures results from the full three-dimensional carrier confinement on a nanometer scale. Therefore, a semiconductor quantum dots, InAs dots embedded in GaAs, behave like non- or weakly interacting single atoms. In addition, the realization of device-quality quantum dot structures became possible by the introduction of self-organized growth. Both, molecular beam epitaxy (MBE) and metal organic vapor phase epitaxy (MOVPE) techniques, which are capable of the controlled deposition of a fraction of an atomic monolayer, can be used. View full abstract»

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  • Send a hologram [photorefractive materials]

    Publication Year: 2003 , Page(s): 17 - 23
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (632 KB) |  | HTML iconHTML  

    As computers and the Internet become faster and faster, more and more information is transmitted, received, processed, and stored everyday. The demand for high-speed, large-capacity information systems is pushing scientists and engineers to explore all possible approaches, including electrical and optical means. Photorefractive materials and devices are becoming viable alternatives for information systems. Photorefractive materials, including traditional electrooptic photorefractive crystals as well as photopolymers and photosensitive glasses, have demonstrated their potential in information systems. In this article we describe several applications of various photorefractive materials in information storage, processing, and communication systems. Specifically, we briefly discuss the applications of the traditional electrooptic photorefractive crystals and photopolymers in volume holographic data storage (VHDS) and information processing. Then, we discuss our recent works on the applications of photopolymers, holographic polymer dispersed liquid crystals (H-PDLC), and photosensitive glasses in photonic devices for optical fiber communications. View full abstract»

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  • IS-95 CDMA and CDMA 2000: Cellular/PCS Systems Implementation [Book Review]

    Publication Year: 2003 , Page(s): 31
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    Freely Available from IEEE
  • Power Electronics Handbook [Book Review]

    Publication Year: 2003 , Page(s): 31
    Save to Project icon | Request Permissions | PDF file iconPDF (162 KB) |  | HTML iconHTML  
    Freely Available from IEEE
  • Fast Analytical Techniques for Electrical and Electronic Circuits [Book Review]

    Publication Year: 2003 , Page(s): 31 - 32
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    Freely Available from IEEE
  • Functional Decomposition with Applications to FPGA Synthesis [Book Review]

    Publication Year: 2003 , Page(s): 32
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    Freely Available from IEEE
  • Survey of Instrumentation and Measurement [Book Review]

    Publication Year: 2003 , Page(s): 32 - 33
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    Freely Available from IEEE
  • VLSI Synthesis of DSP Kernels: Algorithmic and Architectural Transformations

    Publication Year: 2003 , Page(s): 33 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (249 KB) |  | HTML iconHTML  

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  • New Products

    Publication Year: 2003 , Page(s): 34 - 35
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    Freely Available from IEEE
  • Society News

    Publication Year: 2003 , Page(s): 36
    Cited by:  Papers (2)
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    Freely Available from IEEE
  • Author Index

    Publication Year: 2003 , Page(s): 40 - 42
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    Freely Available from IEEE
  • Subject index

    Publication Year: 2003 , Page(s): 42 - 46
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    Freely Available from IEEE

Aims & Scope

IEEE Circuits and Devices Magazine (1985-2006) covers the design, implementation, packaging, and manufacture of micro-electronic and photonic devices, circuits and systems

 

This Magazine ceased publication in 2006.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Dr. Ronald W. Waynant
r.waynant@ieee.org