126 research outputs found
A 22-nm FDSOI CMOS Low Noise active balun achieving < -44-dBc HD3 up to 1.5-V p-p output swing over 0.01-5.4-GHz for direct RF sampling applications
No full textIn this article, we propose a CMOS active balun targeting high linearity up to high voltage swing and over wide bandwidth for direct RF sampling applications. All the blocks of this active balun are derived using a common highly linear building block (HLBB). The HLBB is designed using an inverter with strong source degeneration. To increase the linearity of this HLBB further, its nonlinearity mechanisms are analyzed in detail. A bootstrapping technique is included in the HLBB to reduce the dominant nonlinearity. Furthermore, a pre-distortion technique cancels most of the non-linearity of the output driving stages. All the linearization techniques proposed are robust to process, voltage, and temperature (PVT) changes. The measured results of the active balun realized on-chip in a 22-nm FDSOI CMOS shows < - 44-dBc third harmonic distortion (HD3) up to 1.5- V p-p output swing over 0.01-5.4 GHz. The measured gain and phase errors of the balun action are less than 0.5 dB and ± 5, respectively. The chip is powered from a 5-V supply and dissipates 925 mW.</p
Immune responses against hepatitis C virus genotype 3a virus-like particles in mice: a novel VLP prime-adenovirus boost strategy
No full textAbstract not availableAnuj Kumar, Soma Das, Ranajoy Mullick, Priyanka Lahiri, Ranjitha Tatineni, Debashree Goswami, Prasanna Bhat, Joseph Torresi, Eric James Gowans, Anjali Anoop Karande, Saumitra Da
Tracing the building of Robert's connections in mathematical problem solving: a sixteen-year study
No full textThis research analyzes how external representations created by a student, Robert, helped him in building mathematical understanding over a sixteen-year period. Robert (also known as Bobby), was an original participant of the Rutgers longitudinal study where students were encouraged to work on problem-solving tasks with minimum intervention (Maher, 2005). The research demonstrates how Robert built robust counting techniques by tracing the evolvement of his problem-solving heuristics, strategies, justifications and external representations. The study also examines how Robert made connections to his earlier problem solving. In addition, the origins of Robert’s ideas related to Pascal’s Triangle and Pascal’s Pyramid are investigated. Fifteen sessions were selected between Robert’s fifth grade (February 26, 1993) and post-graduate interviews (March 27, 2009) yielding more than twenty hours of video data. Powell, Francisco, and Maher (2003) model was used for analysis where by each session was viewed, transcribed and coded for critical events to create a comprehensive narrative. The study reveals that mature combinatorial techniques were a part of Robert’s counting strategies as early as middle school. Robert used binary notation to count two-colored candle arrangements and later to count the number of ways a team could win a World Series; modified exponential formulae to account for combinations for a garage door opener, arrangements for n-colored candles and n-toppings pizzas; discovered the combinations formula, C(n, 2), in his eleventh grade; and connected these solutions to Pascal’s identities. In general, Robert looked for patterns in his solutions; generalized the findings; and identified structural similarities in tasks presented to him as he connected three-position garage door opener to three-colored candles arrangements, pizza with four toppings to towers four high, and directions on Pascal’s Triangle to routes for a taxi on a two-dimensional grid. External representations created by Robert served as communication tools for him and provided insight into his problem solving heuristics and mathematical understanding. The research contributes to the growing body of case studies from Rutgers longitudinal study providing evidence that building of early mathematical ideas is the foundation of more advanced learning (Davis & Maher, 1997).Ph.D.Includes bibliographical referencesIncludes vitaby Anoop Ahluwali
Third Revision of the Global Surface Seawater Dimethyl Sulfide Climatology (DMS-Rev3)
No full textThis dataset contains all the input data and the Matlab codes for the Third Revision of the Global Surface Seawater Dimethyl Sulphide Climatology (DMS-Rev3)
Shrivardhan Hulswar, Rafel Simo, Martí Galí, Thomas G. Bell, Arancha Lana, Swaleha Inamdar, Paul R. Halloran, George Manville and Anoop S. Mahajan
*corresponding author: Anoop Sharad Mahajan ([email protected])
Details to run the code can be found in the word file: Code details.doc
Third Revision of the Global Surface Seawater Dimethyl Sulfide Climatology (DMS-Rev3)
No full textThis dataset contains all the input data and the Matlab codes for the Third Revision of the Global Surface Seawater Dimethyl Sulphide Climatology (DMS-Rev3)Shrivardhan Hulswar, Rafel Simo, Martí Galí, Thomas G. Bell, Arancha Lana, Swaleha Inamdar, Paul R. Halloran, George Manville and Anoop S. Mahajan*corresponding author: Anoop Sharad Mahajan ([email protected])Details to run the code can be found in the word file: Code details.docxTHIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV
Wide band linearization techniques for RF receiver front-ends
No full textThis thesis presents wideband linearization techniques for RF receiver front-ends. The thesis is divided into two parts. The first part proposes a wideband-IF, linear, down-conversion-based receiver front-end mainly for cognitive radio applications. The second part presents a wideband, linear active balun capable of driving gigahertz ADCs up to their full-scale input voltage for direct RF-sampling applications. Driven by Moore's law, transistors have become faster and more compact, increasing the digital capability of a system significantly. The performance of the RF front-ends succeeding or preceding the digital blocks also needs to be increased to match the advances in the digital domain. Data acquisition and communication are examples of such systems where a significant increase in the performance of the RF front ends is paramount. RF receiver front-ends are one of the main constituents of these systems and this thesis focuses on increasing their linearity and bandwidth. RF receivers can be realized primarily either as down-conversion-based or as direct RF-sampling-based. This thesis contributes to increase the linearity and bandwidth in the applications involving both types of receivers.A traditional down-conversion-based receiver architecture has evolved over the decades. Several outcomes of this evolution have benefited a receiver's linearity and bandwidth. An example is a mixer-first receiver, the evolution of which has increased a receiver's achievable linearity to an extent that many recent works target to remove the pre-select filter in the receiver's signal chain. Nevertheless, while targeting high in-band linearity, existing mixer-first receiver architectures show various trade-offs with other performances. This thesis analyses a trade-off that exists between the in-band linearity and NF of the mixer-first receivers in detail, including deriving corresponding symbolic expressions and graphical illustrations. The trade-off that exists between the linearity and RF frequency range of an LNTA operating at RF frequencies is also analysed with detailed simulations. A baseband-matching-resistor noise-cancelling receiver architecture is proposed in this thesis which breaks these trade-offs. Furthermore, to achieve high linearity over a wide TIA bandwidth, a three-stage inverter-only OpAmp with 7.6GHz UGB is designed. The inverter-only design favours its redesign and reuse with the scaling of the technology. The proposed receiver realized on-chip in an FDX 22nm CMOS process measures >9dBm IIP3 over 175MHz TIA bandwidth. The measured NF varies between 2.5 to 5dB in the frequency range between 1 and 6GHz. With the recent advances, gigahertz ADCs support >8bit resolution over >4GHz. Besides the gigahertz ADC, realizing a high-performance balun preceding it is challenging. This balun needs to deliver high voltage swings to the input of the ADC with high linearity over a wide bandwidth. Existing baluns do not favour CMOS integration as they are either off-chip and passive or are fabricated using exotic non-CMOS processes. Existing CMOS active baluns mainly focus on down-conversion-based receivers and are not capable of delivering high voltage swings. A wideband CMOS active balun achieving high linearity up to high voltage swings is proposed in the second part of this thesis. The circuit consists of an LNA at the input followed by an actual balun and the driver blocks. Since the driver blocks experience higher i/o voltage swings compared to other blocks, a PVT robust pre-distorter circuit is used to reduce their distortion. All the circuits are derived from a common highly linear building block (HLBB). The HLBB is evolved from an inverter with strong source degeneration whose dominant nonlinearity mechanisms are analysed in detail. The derived symbolic expressions and simulation results show that there is a limit to increase the strength of source degeneration, after which the linearity benefits are not obtained. A bootstrapping technique is employed in the HLBB to extend this limit and continue to obtain the linearity benefits of the source degeneration. The CMOS active balun fabricated on-chip in an FDX 22nm CMOS process measures < −44dBc HD3 up to 1.5Vp-p over 0.01-5.4GHz. The measured CP1dB corresponds to 2.8Vp-p. The measurement results confirm that all the linearization techniques proposed are robust to PVT variations.<br/
Recommended from our members
Two stories from "Trishanku Aur Anya Kahaniyam", by Mannu Bhandari. A translation and commentary
No full textMannu Bhandari is a critically-acclaimed author in contemporary India. The two stories from Trishanku Aur Anya Kahaniyam (Trishanku and Other Stories), "Trishanku" and "Darar Bharne Ki Darar" ("The Rift of Filling in the Rift"), are presented translated from the original Hindi into English. These stories, written from the viewpoint of adolescent female narrators, explore the concept of rebelling against long-established tradition in India, seen from the standpoint of young persons seeking maturity. Each contains a 'story within a story' wherein a marriage is highlighted: one a non-traditional 'love-marriage,' and the other a traditional, arranged marriage which is unhappy. In addition, there is a commentary in which facets of Mannu Bhandari's literary skill and implications of the above-mentioned themes are considered, and various problems of translating from the Hindi language into English while trying to do justice to a consummate artist are discussed
Outsourcing and Off-shoring: Options for the US Construction Industry
No full textThe construction industry relies on the skills of structural engineers for all projects. There exists a large volume of design and detailing work for structural engineering in the United States (US) and there are insufficient numbers of qualified designers in the US to do the work. Recent changes in the telecommunications sector make off-shoring structural design work to developing countries like India and China a realistic possibility. Economics of outsourcing is a key reason for this possibility to be realized. It is logical to consider the effects of outsourcing in the design sector and its effects on the construction industry. The manuscript will present the author’s finding based on detailed case-study model research with two companies that are outsourcing work to India from the US. The author conducted detailed interviews with principals in US structural design firms and then traveled to Bangalore, India to interview their Indian counterparts. Results from these interviews are presented. The author will present an empirical model for outsourcing construction activities. Processes in the construction industry that are most suited for outsourcing and off-shoring are presented. Issues surrounding outsourcing such as training, economics and logistics are discussed. In the past decade outsourcing and off-shoring have become prevalent practices in many industries. White colla
Book Reviews
No full textBook 1Book Title: Shared care for asthmaBook Authors: Mark Levy, Jon Couriel, Roland Clark, Stephen Holgate, & Anoop ChauhanPp. x + 219. Illustrated. R340. ISlS Medical Media. 1997. ISBN 1-899066-41-1.Book 2Book Title: Proceedings of the 8th world congress on painBook Authors: Troels S. Jensen, Judith A. Turner & Zsuzsanna Wiesenfeld-HallinPp. xvi + 965. $75. IASP Press. 1997. ISBN 0-931092-18-3.Book 3Book Title: Western medicine: an illustrated historyBook Author: Irvine Loudon (Ed.)Pp. xvi + 347. Illustrated. R282. Oxford University Press. 1997. ISBN 0-19-820509-0
- …
