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A voltage domain correction technique is proposed to mitigate the timing skew errors in time interleaved (TI) analog to digital converters (ADCs). The proposed technique exploits the fact that any timing skew in the sampling edge of a clock results in a corresponding error in sampled voltage that propagates through the ADC. The technique intends to cancel this voltage error by applying a correction...
This paper presents a new method for ring amplifier biasing to improve their stability while maintaining high slew rate. A multi-path ring amplifier is proposed for switched capacitor applications that allows accurate charge transfer at high speeds. Dynamic biasing improves large signal slewing without affecting residue amplifier settling performance. Stable operation is possible because the auxiliary...
Space Bandwidth Product (SBP) is a process by which the imaging capacity of an optical is measured. The space bandwidth product analysis for inline and off-axis digital holography process is studied. This paper deals the analysis of two essential parameters i.e. image resolution and field of view of both systems. By this demonstration the maximum spatial frequency that captured by the CCD depends...
Flexible spectrum ROADMs facilitate networks to support channels operating at heterogeneous line rates by allocating spectral resources in a dynamic and flexible manner leading to better Spectral Efficiency. In a realistic network, traffic scenario is very dynamic in nature leading to continuous tear down of existing demands and set up of new demands. This dynamic tear down and set up process leads...
In this research article, a compact dual band asymmetric coplanar strip-fed printed antenna is designed and presented for Bluetooth, WLAN/WiMAX and public safety applications. The dual frequency operating bands (2.45 GHz and 5.25 GHz) have been achieved by attaching two simple meander shaped radiating strips to the ACS feed line. The proposed antenna geometry is printed on a low cost FR4 substrate...
Broadband technologies are playing a very significant role in the information exchange world. There is a growing trend toward bandwidth-hungry applications driven by data/ video consumption and continuous availability of service. Applications in different areas like in-flight entertainment, maritime connectivity, industrial communications, cellular backhaul via satellite, Internet access to end user,...
This paper presents a new voltage control technique for grid-connected single-phase AC/DC converters. The proposed control system is able to significantly improve the performance of the closed-loop control system by using a nonlinear observer to extract the DC value of the DC-bus voltage. The proposed nonlinear observer is able to completely eliminate the impact of double-frequency ripple inherent...
This paper describes the design of 4.2 to 5.9 GHz CMOS power amplifier (PA) for applications in ultra-wideband (UWB) commuincations. The PA operates in the linear region over the input range of −12 dBm and delivers an output power of 6 dBm. The post layout simulations indicate the power added efficiency (PAE) is more than 35% at 5 GHz frequency and more than 20% between 4.2 GHz and 5.9 GHz. The input...
This paper presents a new voltage control technique for grid-connected single-phase AC/DC converters used in an energy storage power conditioning system. The energy storage unit is intended to be used in a single-phase distributed generation. The proposed control system is able to significantly improve the performance of the closed-loop control system of the converter by using a nonlinear signal processing...
A wide bandwidth VCO-based continuous-time ΔΣ modulator that uses combined phase and frequency feedback to mitigate VCO non-linearity and ease DEM timing requirement is presented. Fabricated in 65nm CMOS process, the prototype modulator operates at 1.2GS/s and achieves 71.5dB SNDR in 50MHz bandwidth while consuming 54mW of power, which translates to an FoM of 176fJ/conv-step.
Software defined networking[1][9] has brought a rapid change in networking industry by providing programma-bility and abstraction. it also enables centralization of control in infrastructure. In this paper, we describe the results of our experiment to determine the performance of SDN by simulating Open vSwitch under conditions of congestion. We did experiments on MININET by creating four compute nodes...
This paper represents the antenna with a Dielectric Resonator of conical shape fed by micro-strip line providing the results for Ultra Wide Band region satisfying the limits set by FCC for UWB region i.e. 3.1–10.6 GHz. Theoretical results are achieved for the design with range of frequencies 2.72–11.36 GHz and covering the further region of frequency band from 20 GHz to onward. Detailed study of the...
In this paper, an antenna design has been proposed which supports multi-band frequency ranges for handheld devices i.e., WLAN (5.2 GHz), Bluetooth (2.4 GHz), etc. The input impedance of the antenna is 50Ω. FR4 is used as a substrate having permittivity 4.4. The proposed design has a compact size which is compatible with the present handheld devices. Planar Inverted-F Antennas or simply...
Video applications are an important part of mobile devices. Capacity of battery is increasing maximum of 10 percentage per year, which may not be sufficient for upcoming application and operating system. Power consumption by video application depends on factors like network load, signal quality, bandwidth and it can be optimized through heuristics based streaming. The work presented here exploits...
A wide band metamaterial based electrically small Lshapedmonopole antenna is proposed for the application of Wimax and Wifi. It is easy to fabricate due to planar and compact structure. The coplanar waveguide (CPW) feed is used to provide better bandwidth. The bandwidth of the proposed antenna is 2.5789 GHz. Compactness of antenna is achieved by using ring resonator having a metamaterial property.
Handheld devices are ubiquitous in today's world. With their advent, we also see a tremendous increase in device-user interactivity and real-time data processing needs. Media (audio/video/camera) and gaming use-cases are gaining substantial user attention and are defining product successes. The combination of increasing demand from these use-cases and having to run them at low power (from a battery)...
A Power Amplifier (PA) for wireless applications operating between 2.6 GHz and 3.4 GHz with power added efficiency (PAE) of more than 40% is presented in this paper. By varying the width of the PA transistor, the performance of the PA in terms of PAE and stability is studied. The PAE is more than 40% for the bandwidth of 800 MHz. The input matching circuit is implemented using on-chip transmission...
Manycore architecture system includes more number of processing elements to improve the performance while sustaining power considerations. Accelerating heterogeneous manycore computing elements involves huge amount of memory copy, computation and thread management. Applications of manycore architectures range from desktop computer to ware-house-scale computer. In this paper, the state-of-the-art trends...
We present a novel tool called XGossip for Internet-scale cardinality estimation of XPath queries over distributed XML data. XGossip relies on the principle of gossip, is scalable, decentralized, and can cope with network churn and failures. It employs a novel divide-and-conquer strategy for load balancing and reducing the overall network bandwidth consumption. It has a strong theoretical underpinning...
We developed a miniature and low-cost radar (radio detection and ranging) sensor for mobile devices. A radar differs from other mobile sensors — it provides diverse capabilities such as detection, tracking, ranging, and imaging. As a proof-of-concept for a radar sensor, we prototyped two X-band radars: using miniaturized X-band antennas: an X-band bi-static radar and time-division multiplexed, multiple-input...
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