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Author: Cam Nguyen
Publisher:
ISBN: 9783319531069
Category : Microwaves
Languages : en
Pages : 113
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Book Description
Author: Cam Nguyen
Publisher:
ISBN: 9783319531069
Category : Microwaves
Languages : en
Pages : 113
Get Book Here
Book Description
Author: Cam Nguyen
Publisher: Springer
ISBN: 3319531077
Category : Technology & Engineering
Languages : en
Pages : 118
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Book Description
This book presents the design of ultra-wideband (UWB) impulse-based transmitter and receiver frontends, operating within the 3.1-10.6 GHz frequency band, using CMOS radio-frequency integrated-circuits (RFICs). CMOS RFICs are small, cheap, low power devices, better suited for direct integration with digital ICs as compared to those using III-V compound semiconductor devices. CMOS RFICs are thus very attractive for RF systems and, in fact, the principal choice for commercial wireless markets. The book comprises seven chapters. The first chapter gives an introduction to UWB technology and outlines its suitability for high resolution sensing and high-rate, short-range ad-hoc networking and communications. The second chapter provides the basics of CMOS RFICs needed for the design of the UWB RFIC transmitter and receiver presented in this book. It includes the design fundamentals, lumped and distributed elements for RFIC, layout, post-layout simulation, and measurement. The third chapter discusses the basics of UWB systems including UWB advantages and applications, signals, basic modulations, transmitter and receiver frontends, and antennas. The fourth chapter addresses the design of UWB transmitters including an overview of basic components, design of pulse generator, BPSK modulator design, and design of a UWB tunable transmitter. Chapter 5 presents the design of UWB receivers including the design of UWB low-noise amplifiers, correlators, and a UWB 1 receiver. Chapter 6 covers the design of a UWB uniplanar antenna. Finally, a summary and conclusion is given in Chapter 7.
Author: Meng Miao
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The low-cost low-power complementary metal-oxide semiconductor (CMOS) ultra wideband (UWB) transmitter and receiver front-ends based on impulse technology were developed. The CMOS UWB pulse generator with frequency-band tuning capability was developed, which can generate both impulse and monocycle pulse signals with variable pulse durations. The pulse generator integrates a tuning delay circuit, a square-wave generator, an impulse-forming circuit, and a pulse-shaping circuit in a single chip. When integrated with the binary phase shift keying (BPSK) modulator, the transmitter front-end can generate a positive impulse with 0.8 V, negative impulse with 0.7 V, as well as the positive/negative monocycle pulse with 0.6 -- 0.8 V, all with tunable pulse durations. The UWB receiver front-end including the template pulse generator, low noise amplifier (LNA), and multiplier was developed. The cascoded common-source inductively degenerated LNA, with extended ultra-wideband ladder matching network, as well as shunt-peaking topology, was selected to form the impulse-type UWB LNA. The structure-optimized and patterned ground shield (PGS) inductors were also studied and used in LNA design to improve the LNA performance. The maximum gain of 12.4 dB was achieved over the band. For the 3-dB bandwidth, 2.6 -- 9.8 GHz was achieved. The average noise figure of 5.8 dB was achieved over the entire UWB band of 3.1-10.6 GHz. The UWB multiplier based on the transconductor multiplier structure was investigated, with the shunt-peaking topology applied to achieve the pole-zero cancellation and extend the multiplier bandwidth from 2 GHz to 10 GHz. A low-cost, compact, easy-to-manufacture coplanar UWB antenna was developed that is omni-directional, radiation-efficient and has a stable UWB response. It covers the entire UWB frequency range of 3.1 - 10.6 GHz, with the return loss better than 18-dB. This novel uniplanar antenna was integrated with the developed CMOS tunable pulse generator to form the UWB transmitter front-end module. This UWB module can transmit the monocycle pulses and the signals having shape similar to the first derivative of the monocycle pulses, all with the tunable pulse durations. The proposed UWB front-ends have the potential application in short-range communication, GPR, and short-range detections.
Author: Li Qiang
Publisher: LAP Lambert Academic Publishing
ISBN: 9783838368252
Category : Metal oxide semiconductors, Complementary
Languages : en
Pages : 192
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Book Description
The ultra-wideband (UWB) impulse-radio technology has unique features including high data-rate as well as low power consumption with ranging and localization capabilities. An UWB front-end, however, has to accommodate design challenges resulting from the exceptional wide bandwidth of several GHz. This book discusses the implementation issues of the UWB impulse-radio transceiver front-end, including the performance analysis of practical systems and the design of radio-frequency integrated circuits for transceiver front-ends. A general framework for performance evaluation of practical impulse radio system is proposed and demonstrated in scenarios of high-speed data communications as well as low-data-rate wireless body-area networks. An inductorless low- noise amplifier is designed with syncretic adoption of thermal noise canceling, capacitor peaking, and current reuse. The CMOS ransmit/receive switch design with highest reported bandwidth and power handling capability are discussed with customized transistor layout and triple-well resistive body- floating techniques. The prototypes have been demonstrated in state-of-the-art 130nm CMOS technology.
Author: Rui Xu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Ultra-wideband technology (UWB) has received tremendous attention since the FCC license release in 2002, which expedited the research and development of UWB technologies on consumer products. The applications of UWB range from ground penetrating radar, distance sensor, through wall radar to high speed, short distance communications. The CMOS integrated circuit is an attractive, low cost approach for implementing UWB technology. The improving cut-off frequency of the transistor in CMOS process makes the CMOS circuit capable of handling signal at multi-giga herz. However, some design challenges still remain to be solved. Unlike regular narrow band signal, the UWB signal is discrete pulse instead of continuous wave (CW), which results in the occupancy of wide frequency range. This demands that UWB front-end circuits deliver both time domain and frequency domain signal processing over broad bandwidth. Witnessing these technique challenges, this dissertation aims at designing novel, high performance components for UWB signal generation, down-conversion, as well as accurate timing control using low cost CMOS technology. We proposed, designed and fabricated a carrier based UWB transmitter to facilitate the discrete feature of the UWB signal. The transmitter employs novel twostage -switching to generate carrier based UWB signal. The structure not only minimizes the current consumption but also eliminates the use of a UWB power amplifier. The fabricated transmitter is capable of delivering tunable UWB signal over the complete 3.1GHz -10.6GHz UWB band. By applying the similar two-stage switching approach, we were able to implement a novel switched-LNA based UWB sampling receiver frontend. The proposed front-end has significantly lower power consumption compared to previously published design while keep relatively high gain and low noise at the same time. The designed sampling mixer shows unprecedented performance of 9-12dB voltage conversion gain, 16-25dB noise figure, and power consumption of only 21.6mW(with buffer) and 11.7mW(without buffer) across dc to 3.5GHz with 100M-Hz sampling frequency. The implementation of a precise delay generator is also presented in the dissertation. It relies on an external reference clock to provide accurate timing against process, supply voltage and temperature variation through a negative feedback loop. The delay generator prototype has been verified having digital programmability and tunable delay step resolution. The relative delay shift from desired value is limited to within 0.2%.
Author: Edmund James Colli-Vignarelli
Publisher:
ISBN:
Category :
Languages : en
Pages : 546
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Book Description
Author: Thomas H. Lee
Publisher: Cambridge University Press
ISBN: 9780521835398
Category : Computers
Languages : en
Pages : 232
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Book Description
This book, first published in 2004, is an expanded and revised edition of Tom Lee's acclaimed RFIC text.
Author:
Publisher:
ISBN:
Category : Metal oxide semiconductors, Complementary
Languages : en
Pages :
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Book Description
Impulse generators play an important role in the ultra-wideband (UWB) systems. Particularly in the transmitter, impulse generator performs an interface between input data and the antenna determining the overall performance of the transmitter. After the federal communication commission (FCC) revised the rules for UWB systems usages, the design of impulse generators has been pursued and yet challenging especially using CMOS technology. In this dissertation, three impulse generators are presented with analytical explanations, simulations, and measurements. First, the design and simulation of an impulse generator using TSMC 0.18 ưm CMOS technology is presented. The operating frequency band of the impulse generator is from 3.1 to 10.6 GHz for the application of UWB communications. The structure of the impulse generator is based on the current-steering digital-to-analog converter (DAC). The impulse generator has the feature of high-tunability and easy adoption of modulations. The simulation results show that the output of the impulse generator complies with the FCC regulations and has a power consumption of 27 mW at a 50 MHz pulse repetition frequency. Secondly, an impulse generator using IBM 90 nm CMOS technology for the application of 3.1 to 10.6 GHz UWB systems is proposed. The impulse generator has a simplex architecture using novel digital circuits and a compact passive band-pass filter (BPF). The measurement results show great consistency with the simulation results. The impulse generator has a center frequency of 5.8 GHz and consumes an average power of 0.9 mW at 200 MHz pulse repetition frequency. Finally, an impulse generator using TSMC 0.13 ưm CMOS technology is presented. The operating frequency band of the transmitter is from 22 to 29 GHz for the application of UWB vehicular short-range radar (SRR). The proposed design has a pulse-modulated carrier-based architecture. The simulation results show that the power spectral density of the impulse generator output complies with the FCC regulation with a center frequency tuning range of 800 MHz. The maximum achievable output swing is 1.14 V. The measurement results also show the uniformity with simulation results verifying the work.
Author: Francisco Iwao Hirata Flores
Publisher:
ISBN:
Category :
Languages : en
Pages : 152
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Book Description
Recently the techniques based on Impulse Radio (IR) Ultra Wideband (UWB) have experienced a growing interest in the field of wireless systems. An efficient technique known as Transmitted Reference (TR) UWB, has gained in popularity for low and medium data rates applications such as sensor networks. This technique uses two pulses per symbol period, which are strongly correlated and separated by a well known delay (D). The reception system is composed of a wideband analog delay element and a correlator. The delay line allows making a copy of the received signal with a delay that corresponds exactly to D; the correlation is then made with these two pulses. Despite the apparent simplicity of this type of receiver, its implementation in a low power integrated circuit is not an easy task, especially the delay element which must be wideband for UWB applications. > To overcome this difficulty, a new detection method called Time Delayed Sampling and Correlation (TDSC) has been proposed recently, which will be explained in this document. It uses two analog waveform samplers activated at different times; here the delay D between pulses is applied to the control signals of the two samplers. The delay is generated in a digital way; it becomes programmable and can be used in a multi-user context (a different delay for each user for example). > This document describes the design and implementation of a CMOS prototype for a TDSC-UWB receiver based on TR-UWB detection scheme. The prototype made in CMOS 0.35mm technology, allows the validation of the new detection concept, i.e. TDSC. Thanks to this prototype, it was possible to measure a -3 dB bandwidth of around 1.1 GHz and a sampling frequency of more than 7 GHz. This allows the detection of impulse signals with an input bandwidth of 500 MHz (" 2 ns), which is the minimum bandwidth for the UWB technology.
Author: Prakash Egambaram Thoppay
Publisher:
ISBN:
Category :
Languages : en
Pages : 152
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