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  • 1. Ismail, Mohammed
    et al.
    Rodriguez, De Llera Gonzal DeliaKTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Radio design in nanometer technologies2006Collection (editor) (Other academic)
    Abstract [en]

    Radio Design in Nanometer Technologies addresses current trends and future directions in radio design for wireless applications. As radio transceivers constitute the major bottleneck in a wireless chipset in terms of power consumption and die size, the radio must be designed in the context of the entire system, end to end. Therefore the book will address wireless systems as well as the DSP parts before it gets into coverage of radio design issues. As such, the book is the first volume that looks at the integrated radio design problem as a "piece of a big puzzle", namely the entire chipset or single chip that builds an entire wireless system. This is the only way to successfully design radios to meet the stringent demands of today's increasingly complex wireless systems.

  • 2. Kim, H. J.
    et al.
    Ismail, M.
    De Liera Gonzalez, Delia Rodriguez
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    A 2.4 GHz concurrent radio transceiver architecture for bluetooth and Wi-Fi2005In: ISIE 2005: Proceedings of the IEEE International Symposium on Industrial Electronics 2005, 2005, p. 1151-1154Conference paper (Refereed)
    Abstract [en]

    A radio transceiver architecture for concurrent processing of Bluetooth and Wi-Fi (IEE 802.11b) radio signals in the 2.4 GHz ISM band is presented. The architecture is tailored for low power implementation in a standard deep sub-micron CMOS process. It adopts an innovative frequency plan exploiting adaptive frequency hopping for the concurrent processing and of Bluetooth and Wi-Fi radio signals. A link budget analysis is performed to map out system level requirements to block level specifications.

  • 3.
    Rodríguez de Llera González, Delia
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Automatic Design-Space Exploration of Integrated Multi-Standard Wireless Radio Receivers2006Licentiate thesis, monograph (Other scientific)
    Abstract [en]

    One of the main challenges posed by 4G wireless communication systems is achieving flexible, programmable multi-standard radio transceivers with maximum hardware share amongst different standards at a minimum power consumption. Evaluating the feasibility and performance of different multi-standard/multi-band radio solutions at an early stage, i.e. system level, is key for succeeding in surmounting this challenge. This entails formulation of the transceiver budget for several RF architectures and frequency plans with different degrees of hardware sharing. This task is complicated by the fact that transceiver blocks can have different implementations that lead to different performances. The tools that are available for use at present have only analysis capabilities or address only one standard and/or receiver architecture at a time.

    In the belief that a new approach to this problem is necessary, the work that has led to this thesis proposes a novel methodology that automates the design-space exploration of integrated multi-standard wireless radio receivers. This methodology has been implemented in a multi-standard RF Transceiver Architecture Comparison Tool, TACT. TACT helps surmounting many of the challenges faced by RF system designers targeting multi-standard/multi-band radio receivers.

    The goal of the algorithms TACT is built upon is to find a multi-standard receiver frequency plan and 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. TACT offers RF engineers a deep insight into the receiver behavior at a very early stage of the design flow. It models the impact of critical circuit non-idealities using a high level of abstraction. This reduces the number of design iterations and, thus, the time-to-market of the solution. The reuse of already available intellectual property (IP) blocks is also considered in TACT, what can result in a significant cost reduction of the receiver implementation.

    A case study of a WCDMA/WLAN multi-standard receiver designed using TACT is presented in order to illustrate the capabilities of the proposed techniques.

  • 4.
    Rodríguez de Llera González, Delia
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Methodologies and Tools for the Design and Optimization of Multi-Standard Radio Receivers2008Doctoral thesis, monograph (Other academic)
    Abstract [en]

     One of the main challenges posed by 4G wireless communication systems is achieving flexible, programmable multi-standard radio transceivers with maximum hardware share amongst different standards at a minimum power consumption. Evaluating the feasibility and performance of different multi-standard/multi-band radio solutions at an early stage, i.e. system level, is key for succeeding in surmounting this challenge. This entails for- mulation of the transceiver budget for several RF architectures and frequency plans with different degrees of hardware sharing. This task is complicated by the fact that transceiver blocks can have different implementations that lead to different performances. The tools that are available for use at present have only analysis capabilities or address only one standard and/or receiver architecture at a time.In the belief that a new approach to this problem is necessary, the work that has led to this thesis proposes a novel methodology that automates the design-space explo- ration of integrated multi-standard wireless radio receivers. This methodology has been implemented in a multi-standard RF Transceiver Architecture Comparison Tool, TACT. TACT helps surmounting many of the challenges faced by RF system designers targeting multi-standard/multi-band radio receivers.The goal of the algorithms TACT is built upon is to find a multi-standard receiver frequency plan and budget that meets or exceeds the specifications of the addressed wire- less standards while keeping the requirements of each of the receiver blocks as relaxed as possible. TACT offers RF engineers a deep insight into the receiver behavior at a very early stage of the design flow. It models the impact of critical circuit non-idealities using a high level of abstraction. This reduces the number of design iterations and, thus, the time-to-market of the solution. The reuse of already available intellectual property (IP) blocks is also considered in TACT, what can result in a significant cost reduction of the receiver implementation. A combination of a behavioural-based cooperative multi-agent optimization and deterministic techniques is proposed.The capabilities of the proposed techniques and developed tool are illustrated through case studies addressing different design challenges the design of multi-standard receivers present.The last part of this thesis is devoted to one of the key blocks of any communica- tions receiver: the analog-to-digital converter. This work focuses on modeling and design methodologies for continuous-time ΔΣ modulators. A method to evaluate the stability margin of continuous-time ΔΣ modulators as a function of the timing uncertainty effects is proposed.

  • 5.
    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), Electronic, Computer and Software Systems, ECS.
    Ismail, Mohammed
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    A behavioral-based multi-agent optimization algorithm for system level radio design2009In: Analog Integrated Circuits and Signal Processing, ISSN 0925-1030, E-ISSN 1573-1979, Vol. 61, no 1, p. 35-46Article in journal (Refereed)
    Abstract [en]

    This paper introduces a multi-agent behavioral-based optimization algorithm for system level radio design. Making multi-standard wireless communication receivers that meet their specs while keeping the requirements of the individual blocks as relaxed as possible is the goal of this algorithm. In order to achieve this goal a "divide and conquer" approach is proposed. Different agents focus on different objectives that are pursued in parallel. Agents adopt different behaviors depending on the status of the environment and their interaction with other agents. Agents are cooperative by default as they try to meet their spec without making changes that affect other agents. However, more aggressive behaviors that lead to global changes can be adopted when needed. The interaction between these simple entities yields an emergent behavior able to deal smoothly with the complexity of the problem at hand.

  • 6.
    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), Electronic, Computer and Software Systems, ECS.
    Ismail, Mohammed
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    A frequency plan evaluation tool for multi-standard wireless transceivers2006In: Prime 2006: 2nd Conference on PH.D. Research in MicroElectronic and Electronics, 2006, p. 473-476Conference paper (Refereed)
    Abstract [en]

    This paper introduces a frequency plan evaluation too] for multi-hand, multi-standard wireless transceivers. The implemented algorithm allows RF engineers to systematically analyze the effects of the intermodulation products as well as the harmonic components associated with the input signals, the local oscillator and interfering signals. The effect of the out of-band blockers is also evaluated. This provides very valuable information that helps finding the best intermediate frequency and filter bandwidths to the designer. This evaluation tool is part of a suite of tools called TACT, the purpose of which is to explore the design space of multi-standard radio transceivers. Simulation results on a multi-band WCDMA system verify the validity of the implemented frequency planning scheme.

  • 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), Electronic, Computer and Software Systems, ECS.
    Ismail, Mohammed
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Automated design of a WCDMA/WLAN multi-standard receiver2006In: ICECS 2006 - 13th IEEE International Conference on Electronics, Circuits and Systems: Nice: 10 December 2006 through 13 December 2006, 2006, p. 1320-1323Conference paper (Refereed)
    Abstract [en]

    In this paper we show how TACT, a recently reported [1] radio system design and optimization tool, can be used to optimize the design of a dual mode WCDMA/WLAN receiver. An overview of the underlying frequency planning and receiver budget analysis routines is discussed first. In a case study, a zero-IF WLAN/WCDMA radio receiver is then designed and optimized using the tool. TACT yields optimized design specs for each block in the chain as well as a summary of the system performance obtained. The obtained performance is shown to meet or exceed the requirements of the WCDMA/WLAN standards. As such, the case study validates the benefits of the proposed tool.

  • 8.
    Rodríguez de Llera González, Delia
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Rusu, Ana
    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.
    Automated receiver design and optimization for 4G wireless communication systems2006In: BMAS 2006: Proceedings of the 2006 IEEE International Behavioral Modeling and Simulation Workshop, 2006, p. 132-137Conference paper (Refereed)
    Abstract [en]

    This paper presents the design methodology and underlying algorithms of a tool developed for automated receiver design and optimization for fourth generation (4G) Wireless Communication Systems. An algorithm to systematically design and optimize the receiver budget for the multi-standard case is introduced. The goal of this algorithm is to find a multistandard receiver budget that meets or exceeds the specs of the addressed wireless standards while keeping the requirements of each of the receiver blocks as relaxed as possible. This tool offers RF engineers a deep insight into the receiver behavior at a very early stage of the design flow. It models the impact of some circuit non-idealities using a high level of abstraction. This reduces the number of design iterations and, thus, the time-to-market of the solution. The reuse of already available intellectual property (IP) blocks is also considered in the tool. This can result in a significant cost reduction of the receiver implementation.

  • 9.
    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), Electronic, Computer and Software Systems, ECS.
    Ismail, Mohammed
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    EDA for RF and analog front-ends in the 4G era: Challenges and solutions2007In: European Conference on Circuit Theory and Design 2007, ECCTD 2007, 2007, p. 24-27Conference paper (Refereed)
    Abstract [en]

    Convergence into 4G wireless communication systems pushes the design of radio receivers beyond limits unconceivable only few years ago. The complexity of RF systems has increased enormously as new communication standards have appeared in the wireless scenario. The convergence trends, enabled by the advances in fabrication technology, have driven the Software Defined Radio (SDR) more and more into the RF and analog front-end. There is a clear need for design automation and advanced simulation techniques at the different levels that go from the system idea to chip fabrication. Reducing the number of design iterations between these levels is key in meeting the increasingly tight time-to-market constraints. As of today, there is not a single tool that covers the complete design flow. Instead, there is an intricate puzzle of design and simulation tools that focus on the various steps that go from system to silicon. The amount of RF and analog EDA tools available is certainly scarce in comparison with their digital counterparts. Most of the design work still depends on the radio engineer, making the process less than optimal. This paper describes some of the challenges faced by today's radio designers and discusses some of the solutions provided by the EDA community.

  • 10.
    Rodríguez de Llera González, Delia
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Rusu, Ana
    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.
    Receiver design for integrated multi-standard wireless radios2006In: Radio Design in Nanometer Technologies / [ed] Ismail, Mohammed; Rodríguez De Llera González, Delia, Dordrecht: Springer , 2006, p. 145-171Chapter in book (Other academic)
  • 11.
    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.

  • 12.
    Rodríguez de Llera González, Delia
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Rusu, Ana
    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.
    Tenhunen, Hannu
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    TACT: A multi-standard RF transceiver architecture comparison tool2005In: Circuits and Systems, 2005. 48th Midwest Symposium on, IEEE conference proceedings, 2005, p. 659-662Conference paper (Refereed)
    Abstract [en]

    One of the main challenges posed by 4G wireless communication systems is achieving flexible, programmable multi-standard radio transceivers with maximum hardware share amongst different standards at a minimum power consumption. Evaluating the feasibility and performance of different multistandard/multi-band radio solutions at an early stage, i.e. system level, is key for succeeding in surmounting this challenge. This entails formulation of the transceiver budget for several RF architectures with different degrees of hardware reuse. This task is complicated by the fact that transceiver blocks can have different implementations that lead to different performances. The tools that are available for use at present have only budget analysis capabilities or address only one standard and/or transceiver architecture at a time. We believe that a new approach to this problem is necessary and propose a novel methodology for evaluating the performance of different multi-standard solutions. This paper introduces TACT, our multi-standard RF Transceiver Architecture Comparison Tool. It will help answering many of the challenges faced by designers when realizing a transceiver budget for multi-standard/multi-band radio transceivers.

  • 13.
    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), Electronic, Computer and Software Systems, ECS.
    Xu, Wangren
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Ismail, Mohammed
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    TACT as a learning tool for radio design2007In: MSE 2007: 2007 IEEE International Conference on Microelectronic Systems Education: Educating Systems Designers for the Global Economy and a Secure World, 2007, p. 71-72Conference paper (Refereed)
    Abstract [en]

    TACT is an EDA tool that can be very valuable in an educational context since it can help students in electronics and communications acquiring skills that will be fundamental for their careers. TACT is suite of tools the purpose of which is to explore the design space of multi-standard radio transceivers. The use of this tool can ease and speed up the learning process related to the system level design of chipsets suitable for communication applications. The outputs from TACT can easily be combined with available commercial tools in order to provide a complete design flow from system to silicon. This paper highlights the main features that make of TACT a very useful tool in education.

  • 14.
    Rusu, Ana
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Gustafsson, E. Martin I.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Rodríguez de Llera González, Delia
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Elnaggar, Mohammed Ismail
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Flexible ADCs for wireless mobile radios2007In: 18th European Conference on Circuit Theory Design, ECCTD 2007: Univ Sevilla, Seville, SPAIN, AUG 26-30, 2007, 2007, p. 172-175Conference paper (Refereed)
    Abstract [en]

    The evolution of wireless mobile devices calls for "all-in-one-device", which support a large number of wireless standards and allows wireless connectivity and roaming. This creates the need for adaptive circuits that are able to reconfigure themselves to trade-off power dissipation for performance, depending on the wireless standard to be supported and the required Quality of Service. Therefore, the key features of such mobile devices are flexibility and adaptability. This paper presents the ADCs suitable for mobile radios, keeping focus on flexible architectures. Finally, a programmable ADCs array, which can digitize signal bands from cellular to UWB is presented.

  • 15.
    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.

  • 16.
    Rusu, Ana
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Rodríguez de Llera González, Delia
    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.
    Tenhunen, Hannu
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    The design of a low-distortion sigma-delta ADC for WLAN standards2005In: ISSCS 2005: International Symposium on Signals, Circuits and Systems, Vols 1 and 2, Proceedings, 2005, p. 151-154Conference paper (Refereed)
    Abstract [en]

    A low-distortion sigma-delta analog-to-digital converter (ADC) for Wireless Local Area Network (WLAN) standards is presented. The proposed sigma-delta modulator architecture employs the 4-bit 2(nd) order sigma-delta modulator with swing suppression in a 2-2 modified cascaded configuration, which greatly improves the tonal behavior even at 8X oversampling ratio (OSR). The modulator is designed in 0.18um CMOS process and operates at 1.8V supply voltage. It achieves a dynamic range of 69.1dB and a spurious free dynamic range (SFDR) of 82.2dB for a 10MHz signal bandwidth, and an oversampling ratio of 8.

  • 17.
    Signell, Svante
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Rodríguez de Llera González, Delia
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Ismail, Mohammed
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Radio design for future wireless SOC platforms: An overview2004In: 22ND NORCHIP CONFERENCE, PROCEEDINGS, NEW YORK: IEEE , 2004, p. 277-280Conference paper (Refereed)
    Abstract [en]

    As we move to third and fourth generation wireless providing higher data rates at shorter distances in "hotspots", future handhelds will be able to access different wireless infrastructures, e.g. UMTS and WLAN, from the same wireless device, be it a mobile phone, a PDA or a notebook. As a result SoC platforms for convergent 4G must address the challenge of increased complexity particularly as it pertains to the radio transceiver part of a chipset where power consumption and cost are the main differentiators. This paper presents an overview of the challenges faced in designing highly integrated radios in the context of 4G wireless communications. Aside from important issues such as multi antenna design and standards coexistence in the same SoC platform, we focus our overview on a few main thrusts that will be discussed in some details related to designing digitally programmable and con gurable ADCs, PLLs, analog baseband chains and RF front ends as well as techniques for packaging multi band radios and for achieving " rst pass" silicon success.

1 - 17 of 17
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