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Author: Miguel D. Fernandes
Publisher: Springer
ISBN: 3319189204
Category : Technology & Engineering
Languages : en
Pages : 115
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Book Description
This book demonstrates how to design a wideband receiver operating in current mode, in which the noise and non-linearity are reduced, implemented in a low cost single chip, using standard CMOS technology. The authors present a solution to remove the transimpedance amplifier (TIA) block and connect directly the mixer’s output to a passive second-order continuous-time Σ∆ analog to digital converter (ADC), which operates in current-mode. These techniques enable the reduction of area, power consumption, and cost in modern CMOS receivers.
Author: Miguel D. Fernandes
Publisher: Springer
ISBN: 3319189204
Category : Technology & Engineering
Languages : en
Pages : 115
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Book Description
This book demonstrates how to design a wideband receiver operating in current mode, in which the noise and non-linearity are reduced, implemented in a low cost single chip, using standard CMOS technology. The authors present a solution to remove the transimpedance amplifier (TIA) block and connect directly the mixer’s output to a passive second-order continuous-time Σ∆ analog to digital converter (ADC), which operates in current-mode. These techniques enable the reduction of area, power consumption, and cost in modern CMOS receivers.
Author: Ibukunoluwa Adedapo Momson
Publisher:
ISBN:
Category : Radio
Languages : en
Pages :
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Book Description
The increasing bandwidth of silicon integrated circuits technology has enabled generation of carrier signals at sub-millimeter wave frequencies (greater than 300 GHz), where the narrow fractional bandwidth of carriers translates to large absolute coherence bandwidths. These high frequency carriers and the associated wide coherence bandwidths can make possible high data rate wireless and dielectric waveguide communications. By combining multiple sub-millimeter wave carrier bands (frequency division multiplexing), it is possible to use this portion of the spectrum for even higher bandwidth communication. The transceivers for these applications require only electronic components fabricated in conventional silicon technologies, thus bypassing the complexity of alternative high data rate communication technologies such as photonics that require integration of optical lasers fabricated using III-V technologies. However, implementing a free-space wireless link with sub-millimeter wave carriers is subject to a limited capacity. The transmitted signal in the ideal case experiences attenuation that is inversely proportional to the square of the communication distance. Furthermore, despite the improvement in cut-off frequencies of modern devices, realizing fundamental power gain from active devices at sub-millimeter wave frequencies to provide sufficient transmitted power especially with good power efficiency is still challenging in current silicon technologies. The receiver sensitivity also degrades with operating frequency. These factors ultimately limit the capacity of a sub-millimeter wave wireless communications link because they limit the realizable signal-to-noise ratio of the signal at the receiver output. One way to mitigate these limitations, like in optical fiber communications, is to use a waveguide channel to confine and propagate the modulated carriers to increase the power incident to a receiver. This makes sub-millimeter wave carriers notable candidates for wireline applications. The 315-GHz fully integrated minimum shift keying receiver (MSK) presented in this work can be used for up to 10-Gbps wireline communications at a sensitivity of -21 dBm, requiring 195 mW of power. The receiver tracks the input carrier frequency for synchronization using a phase locked loop receiver architecture. The operating frequency of 315 GHz is the highest for an MSK receiver and for a phase locked loop based receiver that tracks the input signal frequency. To improve sensitivity of receivers, minimizing the receiver noise figure is essential. A 425-to-25 GHz integrated down-converting front-end also presented in this work achieves a noise figure of 17 dB which is the lowest reported for silicon NMOS and SiGe HBT receivers operating above 400 GHz. This is 18 dB lower than the previous minimum noise figure reported around these frequencies. The down-converter is based on a second-order subharmonic push-push mixer and incorporates a hybrid architecture to suppress second harmonic emissions of the local oscillator signal. The down-converter consumes 190 mW of power. This work also demonstrates that a passive switching mixer can have an available output noise power spectral density less than kT, which can make its noise figure less than its conversion loss.
Author: Stephan Carel Blaakmeer
Publisher:
ISBN: 9789036530293
Category :
Languages : en
Pages : 158
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Book Description
Author: Zhong Yuan Chong
Publisher: Springer Science & Business Media
ISBN: 9780792390961
Category : Technology & Engineering
Languages : en
Pages : 234
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Book Description
Analog circuit design has grown in importance because so many circuits cannot be realized with digital techniques. Examples are receiver front-ends, particle detector circuits, etc. Actually, all circuits which require high precision, high speed and low power consumption need analog solutions. High precision also needs low noise. Much has been written already on low noise design and optimization for low noise. Very little is available however if the source is not resistive but capacitive or inductive as is the case with antennas or semiconductor detectors. This book provides design techniques for these types of optimization. This book is thus intended firstly for engineers on senior or graduate level who have already designed their first operational amplifiers and want to go further. It is especially for engineers who do not want just a circuit but the best circuit. Design techniques are given that lead to the best performance within a certain technology. Moreover, this is done for all important technologies such as bipolar, CMOS and BiCMOS. Secondly, this book is intended for engineers who want to understand what they are doing. The design techniques are intended to provide insight. In this way, the design techniques can easily be extended to other circuits as well. Also, the design techniques form a first step towards design automation. Thirdly, this book is intended for analog design engineers who want to become familiar with both bipolar and CMOS technologies and who want to learn more about which transistor to choose in BiCMOS.
Author: Xin Guan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Ultra-Wideband (UWB) technology has become one of the hottest topics in wireless communications, for it provides cost-effective, power-efficient, high bandwidth solution for relaying data in the immediate area (up to 10 meters). This work demonstrates two different solutions for the RF front-end designs in the UWB receivers, one is distributed topology, and the other is based on traditional lumped element topology. The distributed amplifier is one of the attractive candidates for UWB Low Noise Amplifier (LNA). The design, analysis and operation of the distributed amplifiers will be presented. A distributed amplifier is designed with Coplanar Waveguide (CPW) transmission lines in 0.25-[micron] CMOS process for time domain UWB applications. New design techniques and new topologies are developed to enhance the power-efficiency and reduce the chip area. A compact and high performance distributed amplifier with Patterned Grounded Shield (PGS) inductors is developed in 0.25-[micron] CMOS process. The amplifier has a measurement result of 7.2dB gain, 4.2-6dB noise figure, and less than -10dB return loss through 0-11GHz. A new distributed amplifier implementing cascade common source gain cells is presented in 0.18-[micron] CMOS. The new amplifier demonstrates a high gain of 16dB at a power consumption of 100mW, and a gain of 10dB at a low power consumption of 19mW. A UWB LNA utilizing resistive shunt feedback technique is reported in 0.18-[micron] CMOS process. The measurement results of the UWB LNA demonstrate a maximum gain of 10.5dB and a noise figure of 3.3-4.5dB from 3-9.5GHz, while only consuming 9mW power. Based on the distributed amplifier and resistive shunt-feedback amplifier designs, two UWB RF front-ends are developed. One is a distributed LNA-Mixer. Unlike the conventional distributed mixer, which can only deliver low gain and high noise figure, the proposed distributed LNA-Mixer demonstrates 12-14dB gain,4-5dB noise figure and higher than 10dB return loss at RF and LO ports over 2-16GHz. To overcome the power consumption and chip area problems encountered in distributed circuits, another UWB RF front-end is also designed with lumped elements. This front-end, employing resistive shunt-feedback technique into its LNA design, can achieve a gain of 12dB and noise figure of 8-10dB through 3-10GHz, the return loss of less than -10dB from 3- 10GHz at RF port, and less than -7dB at LO port, while only consuming 25mA current from 1.8V voltage supply.
Author: Peter J. Hall
Publisher: Springer Science & Business Media
ISBN: 1402037988
Category : Science
Languages : en
Pages : 408
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Book Description
The Square Kilometre Array (SKA) Project is a global project to design and c- struct a revolutionary new radio telescope with of order 1 million square meters of collecting area in the wavelength range from3mto1cm.It will have two - ders of magnitude greater sensitivity than current telescopes and an unprecedented large instantaneous ?eld-of-view. These capabilities will ensure the SKA will play a leading role in solving the major astrophysical and cosmological questions of the day (see the science case at www.skatelescope.org/pages/page astronom.htm). The SKA will complement major ground- and space-based astronomical facilities under construction or planned in other parts of the electromagnetic spectrum (e.g. ALMA, JWST, ELT, XEUS,...). The current schedule for the SKA foresees a decision on the SKA site in 2006, a decisiononthedesignconceptin2009,constructionofthe?rstphase(international path?nder)from2010to2013,andconstructionofthefullarrayfrom2014to2020. The cost is estimated to be about 1000 M . TheSKAProjectcurrentlyinvolves45institutesin17countries,manyofwhich are involved in nationally- or regionally-funded state-of-the-art technical devel- ments being pursued ahead of the 2009 selection of design concept. This Special Issue of Experimental Astronomy provides a snapshot of SKA engineering act- ity around the world, and is based on presentations made at the SKA meeting in Penticton,BC,CanadainJuly2004.Topicscoveredincludeantennaconcepts,so- ware, signal transport and processing, radio frequency interference mitigation, and reports on related technologies in other radio telescopes now under construction. Further information on the project can be found at www.skatelescope.org.
Author: Cam Nguyen
Publisher:
ISBN: 9783319531069
Category : Microwaves
Languages : en
Pages : 113
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Book Description
Author: Boris Lembrikov
Publisher: BoD – Books on Demand
ISBN: 9533071397
Category : Computers
Languages : en
Pages : 470
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Book Description
Ultra wideband technology is one of the most promising directions in the rapidly developing modern communications. Ultra wideband communication system applications include radars, wireless personal area networks, sensor networks, imaging systems and high precision positioning systems. Ultra wideband transmission is characterized by high data rate, availability of low-cost transceivers, low transmit power and low interference. The proposed book consisting of 19 chapters presents both the state-of-the-art and the latest achievements in ultra wideband communication system performance, design and components. The book is addressed to engineers and researchers who are interested in the wide range of topics related to ultra wideband communications.
Author: Kenichi Okada
Publisher: Springer Science & Business Media
ISBN: 144198514X
Category : Technology & Engineering
Languages : en
Pages : 224
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Book Description
This book describes the state-of-the-art in RF, analog, and mixed-signal circuit design for Software Defined Radio (SDR). It synthesizes for analog/RF circuit designers the most important general design approaches to take advantage of the most recent CMOS technology, which can integrate millions of transistors, as well as several real examples from the most recent research results.
Author: Omidreza Ghasemi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
