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We demonstrate an IQ modulator by employing two monolithic injection-locked VCSELs which are driven to produce pure amplitude modulation. QPSK signals are produced at 10 GBaud with a peak-to-peak modulation voltage of 600 mV.
The electrical characterization of two asymmetric spacer layer tunnel diode samples (denoted XMBE#326 and XMBE#304) with mesa size of 16 μm2 have been undertaken to fully extract their extrinsic and intrinsic components. All measured and modelled data are in excellent agreements. Second Subharmonic mixers working at 35 GHz local oscillator signal were designed using the two samples. The minimum conversion...
Partial Discharge (PD) occurs when insulation containing defects or voids is subject to high voltages. If left untreated PD can degrade insulation until, eventually, catastrophic insulation failure occurs. The detection of PD current pulses, however, can allow incipient insulation faults to be identified, located and repaired prior to plant failure. Wireless technology has paved the path for PD detection...
Direction of arrival (DOA) estimation is currently an active research topic playing a fundamental role in many applications including electromagnetic, tracking systems and signal processing applications. This paper evaluates the performance estimation of Pisarenko Harmonic Decomposition (PHD) algorithm and then compares it with multiple signal classification (MUSIC) method based on narrowband signal...
A Multilevel Cascaded H-Bridge (MLCHB) converter was designed and implemented for the application of an Ironless Axial Flux Permanent Magnet (IAFPM) motor drive. This paper provides an analysis of the IAFPM motor and the performance of the converter's ripple current regulation capabilities. Lastly a comparison between the simulation and the experimental results is presented.
Recent trends in cellular handsets demand SAW resonators with increased performance. Most importantly, improvements in both the resonators' quality factor (Q) and temperature coefficient of frequency (TCF) are needed. The TC-SAW concept employing buried Cu electrodes in SiO2/128°Y-LiNbO3 has attracted considerable practical interest in this view, with the requirement that the spurious transverse modes...
This paper presents an improved model predictive control (MPC) for permanent magnet synchronous motor (PMSM) drives. The proposed MPC is different from the conventional MPC in applying two voltage vectors in every control period. The duty ratio is firstly calculated using a simple but effective method with the consideration of the one-step delay. The cost function is then modified by incorporating...
This paper presents a seven level inverter utilizing switched-capacitor technique. Proposed topology employs two asymmetric DC voltage sources as input and generates a multilevel staircase output. The structure includes a front-end switched-capacitor based DC-DC converter cascaded by a back-end H-bridge inverter. The frontend SC DC-DC converter feeds three DC voltage levels to the H-bridge inverter...
The nonlinear light-matter interaction lies at the heart of controlling the electronic systems for the purpose of developing ultrafast optical switching and modulation devices [1], and attosecond laser technology [2]. In general, the interaction causes the formation of photon dressed state that is a quantum superposition state with energetically spaced sidebands and enables to generate the phase-locked...
This paper quantifies the effects of sharing spectrum between two cellular network operators and its impact on the number of base stations required to meet capacity targets. In particular, it shows the effects of traffic profiles with asymmetric loads on the spectrum sharing dividends. The traffic profiles presented use actual time-of-day data from two different cellular operators using two shared...
In this study, we developed a novel time-resolved fluorescence (TRF)-based immunosensing platform that consisted with the physically stable europium chelate-encapsulated silica nanoparticle and the simplified TRF analyzer. To verify the applicability of developed TRF immunosensing platform toward practical immunoassay, the sandwich immunosensing of cardiac troponin I (cTnI) was accomplished using...
Recent revisions of IEC 60034-27-3 and API 541 now include recommended acceptance criteria for dissipation factor (DF, or tangent delta) measurements and offline partial discharge (PD) analysis, which are common factory acceptance tests of sacrificial coil samples of new medium voltage stator windings. IEC 60034-27-3 recommends acceptance limits for DF & tip-up and API 541 recommends 100 pC for...
We developed a nonspectroscopic optical immunosensing platform employing retroreflection principle. To integrate the retroreflection principle and optical immunosensor, retroreflective Janus microparticle (RJP) was developed as a signaling probe. To analyze the retroreflection signal from RJPs, a highly simplified nonspectroscopic optical transducer was constructed using common polychromatic-light...
This paper highlights a 14nm Analog and RF technology based on a logic FinFET platform for the first time. An optimized RF device layout shows excellent Ft/Fmax of (314GHz/180GHz) and (285GHz/140GHz) for NFET and PFET respectively. A higher PFET RF performance compared to 28nm technology is due to a source/drain stressor mobility improvement. A benefit of better FinFET channel electrostatics can be...
RESET distribution of phase-change random access memory (PRAM) is highly related to heat fluctuations during RESET write (RESETW). In this work we investigate the effect of load resistance (RL) with constant voltage write method and propose new RESETW method with an optimal RL selection equation with considering Joule heating and thermoelectric effects. Since the optimal RL compensates for intrinsic...
Perpendicular Spin-Transfer Torque (STT) MRAM is a promising technology in terms of read/write speed, low power consumption and non-volatility, but there has not been a demonstration of high density manufacturability at small geometries. In this paper we present an unprecedented demonstration of a robust STT-MRAM technology designed in a 2x nm CMOS-embedded 40 Mb array. Key features are full array...
Localization and mobility monitoring are fundamental functions for constructing a smart living space. This paper presents a smart living platform based on motion sensing carpets. It is developed in the form of 50×50cm ‘puzzle floor mat’ units, which allows the users to assemble by themselves according to their desired shape and area. From the pressure data collected by motion sensing carpets, functions...
We developed a smartphone-based optical transducer employing the light-interference and wavelength-filtering principles. To materialize this, we prepared the optical signal-guide, containing multiple polygonal figures composed of specified color-ratio, on the digital display. When the biosensing channel, which can induce the enzyme-mediated chromogenic reaction, was located between the signal-guide...
We demonstrate a compact low-chirp and energy-efficient integrated hybrid Ill-V/Si transmitter based on a Vernier tunable laser that covers the entire C-band, and a low drive voltage push-pull ring modulator that provides large extension ratio and low chirp.
the technopolis based on nanotechnology in Sri Lanka, has been initiated successfully and entered the development phase of its activities. Central to the frameworks of evaluating sustainability of technopolis, interactions in the eco system are often evaluated. This study employs a comprehensive interaction analysis using the model of seven system functions of technological innovation systems, to...
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