469 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
Food for nought
No full textThe short story, "Food for nought", is written by the listed author above, Shashi Bhat. Now in its 48th year, Best Canadian Stories has long championed the short story form and highlighted the work of many of the writers, throughout their respective careers, who have gone on to shape the Canadian literary canon. Caroline Adderson, Margaret Atwood, Clark Blaise, Lynn Coady, Mavis Gallant, Zsuzsi Gartner, Douglas Glover, Steven Heighton, Isabel Huggan, Mark Anthony Jarman, Norman Levine, Rohinton Mistry, Alice Munro, Leon Rooke, Diane Schoemperlen, Russell Smith, Linda Svendsen, Kathleen Winter, and many others have appeared in its pages over the years and decades, making Best Canadian Stories the go-to source for what’s new in Canadian fiction writing for close to five decades. A continuation of not only a series, but a legacy in Canadian letters. --From publisher description.Published
TWO NEW SPECIES OF POACEAE FROM INDIA
No full textTwo new species of Poaceae namely, Erayrostis santapaui K. G. Bhat & C. R. Nagendran and Chrysopogon pseitdozeylanicus K. G. Bhat & C. R. Nagendran have been described from materials collected by the senior author from Coorg- and South Kanara Districts of Karnataka State, India
Fish distribution dynamics in the Aghanashini estuary of Uttara Kannada, west coast of India
No full textFish diversity (77 species) in the Aghanashini River estuary of the Indian west coast is linked to variable salinity conditions and zones I, II and III for high, medium and low salinity respectively. Zone I, the junction between Arabian Sea and the estuary, had all species in yearly succession due to freshwater conditions in monsoon to high salinity in pre-monsoon. The medium (zone II) and low (zone III) salinity mid and upstream portions had maximum of 67 and 39 fish species respectively. Maintenance of natural salinity regimes in estuary, among other ecological factors, is critical for its fish diversity
Neuropeptide VGF Promotes Maturation of Hippocampal Dendrites That Is Reduced by Single Nucleotide Polymorphisms
No full textThe neuropeptide VGF (non-acronymic) is induced by brain-derived neurotrophic factor and promotes hippocampal neurogenesis, as well as synaptic activity. However, morphological changes induced by VGF have not been elucidated. Developing hippocampal neurons were exposed to VGF through bath application or virus-mediated expression in vitro. VGF-derived peptide, TLQP-62, enhanced dendritic branching, and outgrowth. Furthermore, VGF increased dendritic spine density and the proportion of immature spines. Spine formation was associated with increased synaptic protein expression and co-localization of pre- and postsynaptic markers. Three non-synonymous single nucleotide polymorphisms (SNPs) were selected in human VGF gene. Transfection of N2a cells with plasmids containing these SNPs revealed no relative change in protein expression levels and normal protein size, except for a truncated protein from the premature stop codon, E525X. All three SNPs resulted in a lower proportion of N2a cells bearing neurites relative to wild-type VGF. Furthermore, all three mutations reduced the total length of dendrites in developing hippocampal neurons. Taken together, our results suggest VGF enhances dendritic maturation and that these effects can be altered by common mutations in the VGF gene. The findings may have implications for people suffering from psychiatric disease or other conditions who may have altered VGF levels.Peer reviewe
Fabrication of nanoadjuvant with poly-ɛ-caprolactone (PCL) for developing a single-shot vaccine providing prolonged immunity [Corrigendum]
No full textPrashant CK, Bhat M, Srivastava SK, et al. Int J Nanomedicine. 2014;9:937–950.On page 937, the author affiliations have been listed incorrectly. The correct author list is as follows:Chandravilas Keshvan Prashant1Madhusudan Bhat2Sandeep Kumar Srivastava2Ankit Saxena3Manoj Kumar4Amar Singh3Mohammed Samim5Farhan Jalees Ahmad6Amit Kumar Dinda21Faculty of Engineering and Interdisciplinary Sciences, Jamia Hamdard, New Delhi, India; 2Department of Pathology, 3Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, New Delhi, India; 4Centre for Biomedical Engineering, Indian Institute of Technology, New Delhi, India; 5Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi, India; 6Department of Pharmaceutics, Faculty of Pharmacy, Jamia Hamdard, New Delhi, IndiaRead the original articl
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/
Job motivation in high-tech knowledge work- the unintended detrimental role of management
No full textTitle: Job motivation in high-tech knowledge work- the unintended detrimental role of management Seminar Date: 4th June 2015 Course: FEKH49 Author: Chaitra Harish Bhat Supervisor: Sverre Spoelstra Key Words: Knowledge Worker, Intrinsic Motivation, Extrinsic Motivation, Priority Task, Recognition. Purpose: The purpose of this research is to critically examine the role of intrinsic motivation in knowledge work. It intends to investigate the managerial attempt to motivate knowledge workers and examines the role of the management from the knowledge workers’ perspective. Methodology: This research has taken the interpretive viewpoint. It is a qualitative study with an abductive approach. Eight semi-structured interviews have been conducted and analyzed. Theoretical Perspectives: The theoretical framework is focused mainly on the intrinsic and extrinsic motivation in the context of knowledge work. The knowledge worker’s work ambiguity is presented. And the equity theory of motivation is and analyzed as to how it affects motivation in knowledge work. Empirical foundation: The empirical foundation of this research consists of eight semi-structured interviews conducted in a knowledge intensive firm, Motiv AB. Conclusion: This research shows that even though intrinsic motivation is important, the role of extrinsic motivation is also found to be vital in knowledge workers. In this context, the role of the management can also be detrimental at times (though unintentional) in affecting the knowledge worker motivation
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