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  • 1. Aktas, A.
    et al.
    Ismail, Mohammed
    Pad de-embedding in RF CMOS2001In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 17, no 3, p. 8-11Article in journal (Refereed)
    Abstract [en]

    Welcome to The Chip! We remain committed to bringing you material you can use in your work and research. We solicit your contributions and input on what we present here. Material or short articles on chip design tips, modeling and characterization techniques, yield enhancement, packaging, and test are welcome, as well as news on new chips and start-ups, mergers, acquisitions, partnerships in the microchip business, etc. Please continue to e-mail us at ismail@ee.eng.ohio-state.edu or ntan@globespan.net. In this column, we discuss techniques for RF pad layout and de-embedding, a topic of great interest particularly for implementing radio frequency (RF) circuits in mainstream CMOS technology. Happy reading!

  • 2.
    Atallah, Jad G.
    et al.
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Elnaggar, Mohammed Ismail
    Ohio State University.
    Future 4G front-ends enabling smooth vertical handovers2006In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 22, no 1, p. 6-15Article in journal (Refereed)
    Abstract [en]

    An overview is given of the most important effects that handover considerations have on the design of multistandard mobile radio transceivers. Focus is on the multitude of design issues and challenges that should be taken into account in the RF/analog front-end part. Topics discussed include the convergence challenge, wireless transceiver design challenge, wireless standards, handover initiation, interworking between GSM and DECT, idle mode issues, possible issues when mobile terminals miss pages, procedure while in active communication in DECT mode, procedure while in active communication in GSM mode, and GSM/WLAN handover.

  • 3. Elwan, H.
    et al.
    Alzaher, H.
    Ismail, Mohammed
    A new generation of global wireless compatibility2001In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 17, no 1, p. 7-19Article in journal (Refereed)
  • 4. Helmy, Ahmed
    et al.
    Ismail, Mohammed
    A design guide for reducing substrate noise coupling in RF applications2006In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 22, no 5, p. 7-21Article in journal (Refereed)
  • 5. Hemani, Ahmed
    Charting the EDA roadmap2004In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 20, p. 5-10Article in journal (Refereed)
    Abstract [en]

    Moore’s law has been the guiding principle for defining the semiconductor roadmap ever since it was proposed in 1965. This article examines and proposes a law that plays the role of Moore’s law in the very large-scale integration (VLSI) computer-aided design (CAD) field. This article also examines the difference in nature of semiconductor productivity and design productivity.

  • 6. Park, Seok-Bae
    et al.
    Wilson, James E.
    Ismail, Mohammed
    Peak detectors for multistandard wireless receivers2006In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 22, no 6, p. 6-9Article in journal (Refereed)
  • 7.
    Rodríguez de Llera González, Delia
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Rusu, Ana
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Ismail, Mohammed
    School of Information and Communication Technology, Royal Institute of Technology, Ohio State University.
    Tackling 4G challenges with "TACT": Design and optimization of 4G radio receivers with a transceiver architecture comparison tool (TACT)2006In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 22, no 6, p. 16-23Article in journal (Refereed)
    Abstract [en]

    Today, engineers are faced with the challenge of programming multistandard capabilities. Achieving digital programmability and flexibility in the analog/radio frequency (RF) components of the system is vital in order to achieve this goal. This is where electronic design automation (EDA) tools are needed. The tools facilitate the design of multiband/multimode receivers at different levels. The multistandard RF Transceiver Architecture Comparison Tool (TACT) is a tool that automates the process of design-space exploration for multistandard transceivers like 4G wireless receivers. TACT proposes an interference-oriented approach when evaluating the performance of each possible intermediate frequency to find the most suitable frequency plan. This evaluation takes into account both signals belonging to the standards as well as out-of-band interferers. TACT's objective is finding a multistandard receiver budget that meets or exceeds the specifications of the addressed wireless standards while keeping the requirements of each of the receiver blocks as relaxed as possible. EDA tools will play an important role in the design and verification of wireless systems in order to achieve the software radio paradigm using 4G radio receivers.

  • 8.
    Rusu, Ana
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Dong, Boxian
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Ismail, Mohammed
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Putting the flex in flexible mobile wireless radios - A wideband continuous-time bandpass sigma-delta ADC for software radios2006In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, ISSN 8755-3996, Vol. 22, no 6, p. 24-30Article in journal (Refereed)
    Abstract [en]

    This article has provided a brief overview of the SigmaDelta ADC conversion technologies for SDRs. The wireless receiver challenges were identified, the ADC design considerations and SigmaDelta solutions were discussed, and a low-distortion CT BP SigmaDelta modulator architecture was presented. The article has shown that the proposed CT BP SigmaDelta modulator is suitable for implementing high-IF ADC, making possible the software radio in handhelds. The major challenges in implementing such a high-IF ADC are the power dissipation and the degree of configurability, programmability, and adaptability that can be achieved by applying digital tuning and adaptive calibration.

  • 9.
    Rusu, Ana
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Rodríguez de Llera González, Delia
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Ismail, Mohammed
    The Ohio State University, Columbus.
    Reconfigurable ADCs enable smart radios for 4G wireless connectivity2006In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 22, no 3, p. 6-11Article in journal (Refereed)
    Abstract [en]

    A reconfigurable analog-to-digital converter (ADC) based on a 2-2 modified cascaded sigma-delta (Σ-Δ) modulator designed for a GSM/WCDMA/WLAN/WiMax zero-IF receiver is now available. Employing the second-order feedforward Σ-Δ modulator in a 2-2 modified cascaded configuration, a high linearity over 100 kHz/2 MHz/10 MHz signal bandwidth can be achieved. Application of the P-DWA technique in the first feedback 4-b DAC eliminates the spurious tones associated with the multibit DAC nonlinearity in the WLAN/WiMAX modes.

  • 10.
    Srinivasan, Anand
    KTH, Superseded Departments, Electronics.
    Another dimension in device characterization2000In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 16, no 2, p. 12-18Article in journal (Refereed)
  • 11.
    Tan, Nianxiong
    et al.
    Micro Electron. Res. Center, Ericsson Components AB, Stockholm .
    Wikner, Jacob
    Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology.
    A CMOS digital-to-analog converter chipset for telecommunication1997In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 13, no 2, p. 11-16Article in journal (Refereed)
    Abstract [en]

    Describes a DAC chipset developed specifically for telecommunication applications. The DAC chipset is implemented in Ericsson's in-house 0.6-micron CMOS process and operates on a supply voltage ranging from 1.5 V to 5 V with the number of bits ranging from 10 to 14 bits, and data rate from 50 Msamples/s@1.5 V to over 100 Msamples/s@5 V

  • 12. Tang, Y. W.
    et al.
    Ismail, Mohammed
    A methodology for fast SPICE simulation of frequency synthesizers2000In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 16, no 4, p. 10-15Article in journal (Refereed)
  • 13.
    Westman, Fredrik
    et al.
    Spirea AB.
    Jonsson, Fredrik
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Oberg, Tommy
    Spirea AB.
    Hedqvist, Christer
    Spirea AB.
    Hemani, Ahmed
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    A robust CMOS Bluetooth radio/modem system-on-chip2002In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 18, p. 7-16Article in journal (Refereed)
    Abstract [en]

    The relaxed constraints on Bluetooth RF front-end implementation, together with the requirement of frequency hopping, result in a frequency offset and drift elimination or reduction problem. In the Spirea Bluetooth radio solution BlueTraC, a scalable digital demodulator is used, which gives a flexible, fast, and tunable frequency adjusting implementation. To increase the dynamic range the existing transmit chain is used to tune the LO during receive mode.

  • 14.
    Wikner, Jacob
    et al.
    Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology.
    Gao, Yonghong
    Royal Institute of Technology; Stockholm.
    Tan, Nianxiong
    Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology.
    D/A conversion interface design for DMT-ADSL applications1998In: IEEE Circuits & Devices, ISSN 8755-3996, E-ISSN 1558-1888, Vol. 14, no 6, p. 7-13Article in journal (Refereed)
    Abstract [en]

    For high-speed internet access, high-performance analog front-ends are needed, and data converters are one of the crucial building blocks in these bent-ends. In this article we will report on the modeling and design of a D/A conversion interface for a DMT (discrete multi tone)-based ADSL system that could be integrated into a complete CMOS analog front-end. We will discuss the DMT transmit spectrum and its impacts on data converters, we will focus on modeling and simulating of the whole D/A interface, and we will describe a test chip implemented in a 0.6 μm CMOS process

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