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With recent advancements in SoC integration, modern SoC architectures can employ more than 20 PLLs [1]. To address SoC clocking needs with an ever reducing power budget, a deep sub-mW to low-mW PLL having a FoM between −226dB and −234dB from 0.8GHz to 5GHz is presented. The PLL features a modular implementation and therefore could be used as the local clock source or as part of a clock-generation...
The design and performance of X-band (8-12 GHz) 6-bit MMIC phase shifter is presented. The phase shifter is fabricated in 0.25um GaAs pHEMT technology. Each bit of this phase shifter design is based on an optimum topology to reach balanced and optimal insertion loss, phase shifting accuracy and return loss. A new type of loaded-line topology for small phase shift states is also relevant. The adoption...
Microwave heating can widely be seen in industrial application. A new method for microwave heating numerical calculation and simulation is proposed in this paper, which coupling with Fourier equation and Maxwell's equation. The method use FDTD method to solve Maxwell's equation and Euler method to get differencing heat transfer equation. The numerical analysis results show that the temperature and...
Orthogonal frequency division multiplexing (OFDM) is an effective approach to enhance transmission data rate of the visible light communication (VLC) using a light emitting diode (LED) as the transmitter. However, the inherent nonlinearity of LEDs transmitter imposes performance limitations to the VLC systems. The nonlinearity of LEDs could be changed depending on the conditions of temperature variation,...
In this paper, we investigate an indoor multiuser visible light communication system employing multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM). For each subcarrier in OFDM, the corresponding precoding matrix is calculated in the frequency domain to eliminate multi-user interference. The distances of the multiple transmitter-receiver links are different, which...
A common approach for improving application performance is to process its working set from memory. For datasets that do not fit into DRAM of a single machine this leads to a design of scale-out applications, where the application dataset is partitioned and processed by a cluster of machines. Performance of distributed memory applications, implemented using MPI (Message Passing Interface), inherently...
In this study, we developed a new algorithm to retrieve the gravimetric vegetation water content (GVWC, %) of corn using L-band bi-angular dual-polarized passive microwave TB, corn LAI, height of the corn stalks and areal density of the corn stalks. Based on in-situ measured corn-related three-dimensional structure parameters during various growth stages, simulation databases of corn LAI and optical...
Under some grounding states, the substation's DC system works well, but the switching processes of the insulation resistance bridge in monitoring device might lead to a relay misoperation, that is, such an operation may generate a voltage fluctuation of the relay and when the maximum voltage value exceeds the protection value, the relay will misoperate. When state changes, the earth capacitance will...
A novel adaptive CMOS low-dropout regulator (LDO) is proposed for DDR4 memory power supply. By using a two stage structure, this LDO can adjust its transfer path to afford a very large range of load current from 0 A to 3 A. Two NMOS pass elements are used to do both sourcing and sinking functions, which are not included in traditional LDOs. The improved structure with two NMOS transistors performs...
In order to investigate the influence of rotor eccentricity on magnetic density and core loss, a 55 kW induction motor was taken as an example in this paper, based on electromagnetic theory and Finite Element Method, a field-circuit coupling model was built to study magnetic density distribution and harmonic content with different eccentricity ratios under rated load conditions. The different eccentricity...
This paper considers the scenario of massive machine type communication (MTC) in cellular uplink for short packet traffic. For this traffic type, the closed loop Timing Advance (TA) adjustment process applied in current LTE uplink introduces significant overhead in signaling and energy consumption. We propose to pulse shape the OFDM signals using time-frequency localized prototype filters. This improves...
In this paper, an improved four-phase all PMOS charge pump based on the Pelliconi structure is proposed with high voltage boosting efficiency, strong driving capability and large power efficiency. The proposed charge pump uses a complementary structure to solve the voltage driving problem in the conventional charge pump structures. Two auxiliary substrate switching PMOS transistors are added to mitigate...
Future Fifth-Generation (5G) networks are expected to be underpinned by Software-Defined Networking (SDN) and to predominantly carry multimedia traffic. Ambitious 5G Key Performance Indicators (KPIs) call for reliable, low-latency and high-density networks capable of supporting Ultra High-Definition (UHD) video. Video streaming and multimedia traffic engineering over SDN networks is an important emerging...
This work demonstrates a new electrode configuration for piezoelectric micromachined ultrasonic transducers (PMUTs) with increased electromechanical coupling coefficient (kt2). The electrodes, a center electrode surrounded by a ring electrode, are identical to those used in differential PMUTs. Unlike a differential PMUT, where the two top electrodes (TEs) are referenced to a common ground electrode,...
The NATO research task group IST-118 titled “SOA recommendations for disadvantaged grids in the tactical domain” is addressing the challenge of implementing the Service Oriented Architecture (SOA) paradigm at the tactical level by providing guidance and best practices in the form of a Tactical SOA Profile. The group will conduct identification and feasibility assessments of possible improvements of...
The inherent structure of applications defined with hypertext markup languages is that of a graph. Push-enabled protocols like HTTP/2 drive the need for solutions allowing the server to traverse this graph and preemptively push related resources to the client. In addition to this, user interface adaptation to various mobile devices belongs to the server's tasks. Taking into account the diversities...
In this paper we present a new ultra-wideband 20-way coaxial power combiner. In this new structure, there is a radially extended coaxial cavity and 20 coaxial coupling probes. It can not only be used as power combiner but also power divider. There are several critical parameters we'll discuss here that ultimately determine the performance of the new power combiner. The new structure can efficiently...
We propose leveraging one-dimensional expanded Hybrid codes (1-D E-Hybrid codes) for two-code keying (TCK) in spectral amplitude coding (SAC) optical code division multiple access (OCDMA) networks. The proposed system can utilize all codes and provide a larger code size. The numerical results demonstrate that the 1-D E-Hybrid codes for TCK outperform the existing 1-D approaches, and the data transmission...
An angle measurement antenna system, which consists of one transmitter antenna and three receiving antennas on the same substrate, is designed for the automotive anti-collision radar working in the K-band. For antenna design, Dolph-Tchebyscheff weighting method is used for its perfect balance between low side-lobe and high antenna gain. Besides, the dual-baseline method is adopted in the layout of...
A new generalized path corridor-based local planner for a nonholonomic mobile robot is proposed to avoid dynamic obstacles while following the lead of a global path. Rather than applying the global path directly, the proposed local planner will transform the global path into a normative path. Then, a generalized path corridor (GPC) is constructed based on the normative path. GPC defines the maximum...
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